N'haraz makes a gesture with a tentacle and disappears [minor: Invisibility]. A few moments later a splashing sound from the pool confirms your suspicion that it has chosen the better part of valor.
The other slime mage manages to slip away from Gerold [Nat 1] and the reborn servitor [Nat 1!]
The badly wounded slime mage [ASa] and it's brethren both dodges opportunity attacks [MISSx2] by Lasra as it moves toward the same pool.
[sblock=technically]All three aboleth 2~3 squares down the pool. N'h has invisibility the other two are concealed by the murky water.
The vindictive can take shots at them as they go .[/sblock]