Hi! It's fun to know people are still playing my game! Sorry about you poor ally... it's a very rare thing which only a few enemies can do. Unfortunately, that ally is gone - you can always try to find another one (and there's one companion in the game which will refuse to get devoured). Slightly spoiler-y strategy hint: enemies are more likely to eat your ally when your character is low on health, and this goes off instead of their special move (in a sense, giving your main character some protection).