Dark starts his attack approach flying in from behind the masked halfling.  60 feet covered in first round.

(Before combat begins) One of the halflings looks down to Killian uttering his spell and manages to get his foot out of the way of the shocking grasp in time.

Darnell rushes the first halfling. It raises its spear away from Killian in a vain attempt to deflect the swift dagger slash of the other halfling, failing to block him. (Pikeman 1: 8 damage)

Simmeat wanders around a corner, ending up a little behind the halflings and can see that the three of them have engaged some of the party.

Rumble gets to his feet and begins to use his mastery of the tongue of earth in an attempt to scare the halflings. They seem unfazed by his foreign tongue, more concentrated on the murderous halfling.

Leojym rushes towards his companions, almost at the fray to assist them.

The Halfling Pikemen seem to divide their attacks. The first lunging at Darnell, attempting to use the superior reach to his advantage. The second attempts to stab into Killian's back in retribution to the attempted tasering.

Pikeman's Spear vs. Killian: 22 vs. AC. Hit: 6 piercing damage.
Pikeman's Spear vs. Darnell: 17 vs. AC. Hit: 7 piercing damage.

(Redoing as it comes up as not available to roll)

Pikeman's Spear vs. Darnell: 19 vs. AC. Hit: 5 piercing damage.
Pikeman's Spear vs. Killian: 17 vs. AC. Hit: 6 piercing damage.

(And suddenly it's back!)

Darnell is pierced by the spear, pushing him away from the pikeman. (Darnell: 11/19 HP)

Darkwing soars down with his aided flight towards the combat (he can dash to get 120 feet closer).

NEXT TO GO

Mara

(My bad, missed a post)

Mara launches a bolt of eldritch energy at the halfling that Darnell is retrieving his dagger from. It blasts into its chest, leaving a nasty wound. The halfling is still standing, but looks very injured. (Pikeman 1: 13 damage)

The Masked Halfling sees the sudden set of reinforcements. He holds the piece of grass to his lips again and blows on it, the petals in his other hand seem to react to the magic he is using, as a sleep spell is cast over the area , covering Darnell and Rumble. (He's aimed it so his fellow halflings aren't in it, meaning that Killian isn't in it either since he's between the two of them)

Sleep Hp affected: 19

Rumble and Darnell fall to the ground again, unconscious. 
(If people want to work out why they collapsed, it'd be a DC 11 Arcana check. Otherwise you see them fall over from this halfling's weird grasswhistle)

STILL TO GO

Killian

Killian not very happy about being stabbed after his failed attempt at reaching out to shock the halfling,  from the ground will attack using Magic Missile hitting the three halflings each with one magic dart, then will stand & move away 15 feet hopefully not granting an attack of opportunity for them.  

1st Spear Halfling:  2

2nd Spear Halfling: 5

3rd Caster Halfling: 5

Killian gets to his feet, a spray of missiles shoot out, striking each of the halflings with a potent blow. One of the pikemen falls to the spell, his spear clattering to the ground. (Pikeman 1: defeated, 18 damage. Pikeman 2: 3 damage. Masked Halfling: 4 damage)

 The second pikeman attempts to jab at Killian as he attempts to flee back.
Pikeman 2's attack vs. Killian: 11 vs. AC. Hit: 3 piercing damage.

Killian nimbly escapes without a scratch. Fortunate for him, as he is on his last legs anyway.

INITIATIVE: ROUND 2

Darnell (11/18HP) (unconscious, 9 more rounds)
Simmeat (10/21 HP)
Leojym (8/15 HP)
Rumble (6/21 HP) (unconscious, 9 more rounds)
(Shadow)
Halfling Pikemen 2 (3 damage)
Mara (21/21 HP)
Darkwing (11/18 HP)
Masked Halfling (4 damage)
Killian (3/18 HP)

SCENARIO: Darnell is asleep at the feet of the dead halfling. Simmeat is about 10 feet behind the halflings, while Killian is 15 feet in front of them (beside Rumble). The others can get close this turn to do things (Dark is 30 feet in the air away, the others are about 15 feet away from Killian/Rumble)

Simmeat sees his companions fall to the halflings and looked confused for a moment. After his momentary confusion, he sprinted to the masked halfling and tried to punch him in the back of the head to keep him from whistling again. Then gave two more punches for good measure. 

Attack: 6  Damage: 6

Attack: 6  Damage: 4

Attack: 23  Damage: 6

Simmeat rushes forward and with a flurry of blows, he strikes at the masked halfling. He gets two decent blows, but his middle sweep was avoided. (Masked Halfling: 13 damage)

STILL TO GO

Leojym
Rumble (If woken)

Leojym rushes up to Rumble and shakes him awake. "Now is not time for resting mister Rumble."

"I knew that... wouldn't... woorrrr-..." 

Bam!

And down the earth genasi goo--and he's been shaking away again. In his panic, he starts to flail a little. But once recognition dawns on him, Rumble gives Leo a weak nod in passing before again working his way to his feet. He starts to go for his club in hand, but seeing the already dead (if not simply incapacitated) halfling forms, Rumble winces before looking to the still standing masked one.

"... No... No more of this." Sucking in a deep breathe, he storms over to the masked one without his club, and goes to try and pick him up by the hands. It's his hope to keep those hands of his from doing any more magical funny business. Baring that though, he'd settle for hold him up and saying tersely, "Listen, you! Enough of this nonsense! We ain't here to fight!"  

Athletics: 17 vs Masked Halfings Dexterity(Acrobatics) or Strength(Athletics)

The masked halfling attempts to evade Rumble's grasp.

Acrobatics: 8

The halfling is grasped into Rumble's firm grip, unable to slip out! (Masked Halfling: Grappled)

The Halfling Pikeman looks over to Rumble grabbing the masked halfling. "Master!" It yells before rushing in behind Rumble and attempting to stab him with the spear.

Pikeman 2's Spear vs. Rumble: 24 vs. AC. Hit: 6 piercing.

With a critical strike, the spear guts into Rumble, felling him. His grip slides off of the masked halfling. (Rumble: 0 HP, dying)

STILL TO GO

Mara
Darkwing

Dark slams into the Masked Halfling with his hammer Attack: 21 Damage: 7

Spending 1 Ki point he also performs a fury of blows on the same halfling Attack: 6 Damage: 7   Attack: 12 Damage: 7

Mara will move closer and then uze her bonus action to use her healing light pool to try and stop Rumble from dying. He will be healed by 9 hp. Afterwards she will will attempt to hit the already burt masked Halfing with Toll the Dead.

Toll the Dead :5

Darkwing comes soaring in with a mighty blow with his hammer. He apparently forgot how a d4 works, so I'll roll it for him. 6

The hammer makes contact with the halfling, dealing a minor wound, but this halfling seems to be on the ropes. (Masked Halfling: 17 damage)

Mara uses some healing light that shimmers around Rumble, bringing him back from the brink of death. (Rumble: 9/21 HP)
She then casts her spell at the halfling, the bells tolling for him.
Masked Halfling's Wisdom Saving Throw: 16
The ringing in its ears causes the halfling to crouch to its knees, screaming at the agony before falling over, blood dripping from the eye sockets of the mask. (Masked Halfling Defeated. 22 damage)

STILL TO GO

Killian

Killian on the brink of death will attack using his cantrip Fire Bolt at the last foe, Using his tides of chaos to gain advantage on the attack.

Fire Bolt Attack: Attack: 23 Damage: 2

As a Bonus Action I will expend 2 sorcerer points to regain one 1st level spell slot. 

Killian throws a bolt of fire, striking the remaining halfling in the chest as his grass skirt begins to ignite. (Pikeman 2: 10 damage) As he does so, Killian's theme music begins to kick in a little late into the combat.

INITIATIVE ROUND 3

Darnell (11/18HP) (unconscious, 8 more rounds)
Simmeat (10/21 HP)
Leojym (8/15 HP)
Rumble (9/21 HP)
(Shadow)
Halfling Pikemen 2 (10 damage)
Mara (21/21 HP)
Darkwing (11/18 HP)
Masked Halfling (4 damage)
Killian (3/18 HP)

Scenario: The halfling is screwed! It looks like it wants to run away!

Simmeat saw the remaining combatant trying to flee and slide-tackled him, following it up with a couple hammer fists for good measure. 

Attack: 19  Damage: 6

Attack: 24  Damage: 6

Attack: 17  Damage: 4