Aatrox doesn't use his skill against nobles

I'm not sure if it's specific against nobles (I think so since it's fine for going against other compositions) but my Aatrox did not use his skill at all (after his mana filled up) when going against a noble composition (I think they were 6 nobles). I had Guardian Angel, Rabadon's, and Warmog on Aatrox. I only lost to this composition and eventually just died because of that. Please take a look into this and fix the bug.