Alistair
Spoilerknowledge devotion burly merrow: (1d20+15)[26]
Assuming it is still up, Alistair moves in to attack the hag first, to try and take down the spellcaster before they had a chance to react. Otherwise he will move in to attack the burly merrow.
Spoiler
Rolls assume +4 knowledge devotion, it's -1/-1 if the hag is already down and the attacks are against the large merrow.
sneak attack against flat footed enemy: (1d20+14)[31]
damage: (2d6)[8] + (1d4+18)[21]
tumble if necessary (to avoid aoo): (1d20+13)[18]