Confused by Inner Beast

[Giantbane]

I believe it's designed in such a way that you cannot get more Health back than the remaining HP on the enemy you are attacking.

Which is dumb, I don't see how it makes any sense for balance reasons.

And it's not even a limitation of battle system. DRG's Life Surge, even though worded the same doesn't work that way. Go use it on lvl 1 creatures outside of town. You'll get back something like 50 for an Inner Beast, but you'll get the full amount back from your Life Surge attack, regardless of what you hit or how much life it has left.

You may note that the result is not worded the same.
Inner Beast: you absorb 51 hp
Life Surge: you recover 365 hp

They should change it to use the Life Surge method of "absorption" instead of the stupid one that exists now.