Why would you heal a Mindflayer that will undoubtedly enslave/enthrall you and/or kill you? I mean for real, the three enthralled people trying to free the wounded Mindflayer should be a major red flag here.
If I remember correctly, back when early access started and no fixes or patches had been done, when your character ran up to this encounter, once your character got in range, a dialogue took place between you and the wounded Mindflayer.
If you made the wrong selection/choice or failed a roll, your character died, right there, DEAD.....to the wounded Mindflayer. Larian has since made a couple changes to that whole wounded Mindflayer encounter.
Also, the only Mindflayer to befriend is the one found in the Underdark that actually tries to help you....
I was trying some kind of meta playing (with this character I have a background story to justify the fact she knows some stuff of what she is goinf to confront), my first attempt ended with an obvious dead. The second one was more on the line: heal from distance (using a potion throw at them like it's possible to do with Finral in the secret passage in the Druid's Lair).
I get that Mindfliers are hostile, but my idea was something like: what if the mindflier is healthy when the goblins arrive? What would happen to the scene with Dorr Razlin trying to comunicate whit its corpse? Would they make an alliance? Would they fight against them? Would they start hunting the party?