This is the forum for helping you out if you're stuck in Grimrock 2 or if you want to discuss about the mysteries of the Isle of Nex. Warning: forum contains spoilers!
I didn't obtain that weapon until the cemetery was the only place I had left to clear before the castle, so if anything that special move was a detriment to me... (because basically every enemy there is undead). It even gives the weapon to you in the cemetery like they want you to end up using it on the undead.
did that same thing in the cemetery. wanted to top my rogue off and leeched and he was almost dead.
took me a minute to realize what had happened. then I smiled... good design there
When I first used the Backbiter's "Leech" ability, I thought
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"wouldn't it be cool if using it on undeads reversed the flow of life energy?", but I never tried it on them. Great to see that AH have already implemented this!