Animist Controlled Pet Interrupted/Does nothing

i summoned a "grove's agent" in the creeping spec line, after pulling a mob and getting attacked it doesn't retaliate at all, it should continue casting on the mob without being interrupted (or at the very least attempt to melee, though current tests on live show it shouldn't get interrupted)

https://www.youtube.com/watch?v=sZ5K4EJuprU&feature=youtu.be