A monkey just cast Whirlwind Enemies at me. He ducked a global spell. It's just kinda silly. As a melee block it would be like a martial arts reversal or a sword counter or something cool. Now it's a magic-flinging monkey and racist card art. (We aren't quite that short.)
I have to disagree. If Duck is not enemy-only card (and it's not in my opinion, it's green also) it should stay as it was designed - of course it can lead to slighty weird situations like you've just mentioned. Thank the rename would be good idea, like Wozarg mentioned.