The party observes Fish #A shake its head in distress and Lucas is now up.

(@Grant: According to the turn order, it's Dr. A's turn, but I can take Lucas' turn first if you wish I guess.)

"No... no, no, this.. Th-that ain't right! Surely I-..." Lucas trails off and looks away, still seeming lost in thought despite the harrowing situation, if but for a few moments more. Then following a sigh, he thrusts out a hand and creating a small sphere made by all appearances to be a kaleidoscope of dancing colors. "You have the right of it! Dispatch them quick as you can, or scare'm off!" He called it the others before barking out a final command phrase, sending the ball of energy gathered streaking for through the astral like a deadly meteor for the same one Corwyn assaulted.

Action: Cast (Cantrip)Chaos Burst at same target as Carowyn.
(Lethal)Sorcerous Burst - Attack: 20 For: 21 Acid Damage. (Originally 15, but since one roll was an 8, I was able to roll an additional die)

(OOC: Accidentally rolled twice for that attack, so ignore that 10 to hit)

Dr A acted - you just don’t know what he did!

Passoveloce is now 130 feet away from the swirling melee that is now the two fish creatures and Corwyn.

Fish #B lunges at Corwyn - 1st Attack - Attack: 13 Damage: 15 - 2nd attack - Attack: 27 Damage: 21 - 3rd attack - Attack: 11 Damage: 13

Passoveloce - you’re up followed by Corwyn

"Dammit!" mutters Passoveloce to himself, as he thinks himself to a stop and returns to 45' from the melee, "I guess I'll have to hover and fight, though I do like the thought of firm rock under my feet." 

He fires two arrows at the fish attacking Corwyn (Fish #B)

Attack: 18, damage: 7, Sneak attack Bonus damage: 8

assuming that is a hit, advantage on 2nd attack:
Attack: 24, damage: 10 

Then he stows his shortbow as he realises he will need to pull out his shortsword for the next round.

Action: Attack, Bonus action: Dash (all rolls in game log)