Being Sergeant 2 has fallen to Reggie's bolt, Rubin just has sight on Sergeant 1 who has been attacking Captain Andy. Three bolts fly to the upper deck, two hit on target and is enough to kill Sergeant 1. Only Koalinth remain...but many surround Captain Andy with a bloodlust in their eyes as their see their sergeants die before them. 

Turn 3

Benagol rushes to help the captain (dash action and nothing else), he arrives at the stairs, 15 feet from foe 11, shouting

"leave that man be, it is the captain that you want?! Well it's me, you are biting more than you can chew : bring it on, if you dare!" 

Benagol yells at the Koalinth on the upper deck that HE is the captain of the ship, the Koalinth instinctively look to where the Sergeant was standing for direction. Quickly realizing the Sergeant is dead on the ground, they look at each other questioningly. 

Round 3 initiative order (forgot to post before Rubin's turn):
Rubin
Benagol
Captain Andy
Gerry
Koalinth 11-15
Koalinth 1-5
Reggie
Ardeth

Captain Andy looks around as he is outnumbered. He hears Benagol yell up at the Koalinth that he is the captain. He says "Ai, captain, took ye long 'nough to get to deck! I've been holding down the wheel for ye" He then attacks Koalinth 14, moving to 15 if they fall. 

Captain Andy: 9 Damage: 6
Captain Andy: 15 Damage: 7
Captain Andy: 15 Damage: 6

 Captain Andy strikes down Koalinth 14. Gerry, you're up!

(Think I can get within 5 feet of the Koalinth closest to Benagol)

Gerry trots towards the only Koalinth within his reach.

Attack: 21(1) Damage: 5

Attack: 23(2) Damage: 6

(Reminder that Koalinth 11, 12, and 13 have taken the dodge action.)

DA 1: 25

DA 2: 32

(Bless included) 

Gerry slashes into Koalinth 12. He is heavily wounded, but still standing. 

Koalinth 11 and 13 look at each other, say something in goblinoid, then move to attack Benagol. (I believe you get a reaction when they enter? Go ahead and roll to hit and damage. If it kills it, the roll below doesn't happen) Koalinth 11 steps within 5 feet of Benagol, attacking Benagol. Koalinth 12 steps 5 feet closer to his allies, attacking Gerry. Koalinth 13 just makes it to Benagol's side by jumping over the railing of the steps, attacking Benagol. Koalinth 15 moves 5 feet south, attacking Captain Andy. 

Koalinth 11: 13 Damage: 2 Martial Advantage bonus damage: 10
Koalinth 12: 16 Damage: 2 Martial Advantage bonus damage: 9
Koalinth 13: 10 Damage: 4 Martial Advantage bonus damage: 9
Koalinth 15: 12 Damage: 7

Koalinth 4, who threw is trident at Rubin, jumps down from the upper deck, taking 4 fall damage, and limps over to the left of Rubin to pick up their trident, attacking Rubin. Koalinth 3 moves to the right of Gerry, attacking Gerry. Koalinth 5 moves to Captain Andy, attacking Captain Andy. 

Koalinth 3: 12 Damage: 3 Martial Advantage bonus damage: 6
Koalinth 4: 9 Damage: 4
Koalinth 5: 17 Damage: 4 Martial Advantage bonus damage: 8

Andy takes 11 damage from Koalinth 5. He looks heavily wounded.

Reggie, you're up. Followed by Ardeth's round 3 action. 

ROUND 2 ACTION:

Ardeth sees the Captain of the ship in dire trouble and he moves closer to him holding his warhammer up and chanting to Thor.

[Move west 30 ft]

His eyes glow grey as the clouds darken around vessel.

[Casts Call lightning right above the Captain and the two opponents. Calls lighting on 5. Using Channel Divinity: Destructive Wrath, Ardeth causes maximum lightning damage of 30]

[Dex Saving Throw DC 14]

ROUND 3 ACTION:

Continuing to hold his warhammer above his head Ardeth calls upon Thor again.

[Calls a second bolt of lightning down on 15. Using Channel Divinity: Destructive Wrath again. 30 dmg.]

[Dex Saving Thow DC14]

Koalinth 5 Dex save: 17
Koalinth 15 Dex save: 5

Both of them fall as Ardeth RKO.....I mean calls lightning from out of no where onto the enemies surrounding Captain Andy. 

Reggie is going to run along the upper deck to the opposite side, and take a shot at #3, who is adjacent to a friendly, governing me advantage, which means sneak attack.

Attack: 17 Damage: 6

10 sneak attack

Concentration (somehow missed that one of them hit me): 14(4)

Koalinth 3 is heavily wounded, barely standing after a bolt hits them from Reggie's crossbow. 

Back up to the top of the round, Rubin you're up!

Round 4 initiative order:
Rubin
Benagol
Captain Andy
Gerry
Koalinth 11-15
Koalinth 1-5
Reggie
Ardeth

Rubin targets the one next to him first, then other targets further away...

Attack: 25 Damage: 8

Attack: 22 Damage: 6

Bonus action Attack: 26 Damage: 9

Rubin is able to effortlessly knock 2 bolts into Koalinth 4 with just enough damage to take them out, sending their body over the railing and into the ocean. His last bolt goes to Koalinth 3 and deals the final blow. 3 more koalinths remain! 

Benagol, you're up! Followed by Gerry (Captain Andy returns to driving the ship)

REACTION TURN 3:

As soon as the closest foe (let's say the 11th) comes near him, Benagol tries to pierce him with his glaive

Attack: 15 Damage: 11

ROUND 4

Benagol, seeing the 11th wounded, tries to kcock him down for good

First attack: Attack: 16 Damage: 10

 Attack: 15 Damage: Unable to parse dice roll.

strengthened to see one more enemy down, Benagol attacks the one in front of him (13)

Second Attack: 18 Damage: 13

bonus Attack: 14 Damage: 12