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For now, we can only assume that the fact that healing the mindflayer causes it to die (i.,e. that any direct interaction with it causes it to die, which seems to be the case right now) is, hopefully, a bug.
If you want to be sure that the mindlfayer is absolutely still alive, your surest option is to actually approach it with one character, and give it what it needs to heal itself; a brain snack. Then you can revivify the killed character afterwards. This will definitely get the mindflayer up and able-bodied again, but do be aware that it will immediately attack your party if you do this, if it sees them, and its mind blast will generlly wipe out first and second level characters. You could do this in stealth so that he doesn't see the rest of your party to attack them ,and revive the downed character from afar, if you're careful, or if you don't mind waiting, you can stay away with the rest of your party, and just wait until you can get the scribe to revive them at camp for you.
Oh, wow that's anice strategy that didn't even crossed my mind! I'm going to recruit Shadowheart, separate the two characters, made my one fourth human/one half drow/one fourth wood elf fast travel to camp and use Shadowheart as brain snack (love the definition by the way
).
