Volibear E vs Jungle camps

So i've been playing a fair bit of Volibear recently, and discovered a bug that that allows jungle camps to gain health when you use your E.

Steps to reenact the bug:

1. Walk to a camp (e.g. red buff. gromp)
2. press E BEFORE you attack camp
3. And notice how when you hit the camp monster while feared, it'll regen health.

NOTE: If you attack the targeted monster before using your E you won't have this effect. Hope this helps someone.