Hey guys, I just was in a game where I activated my 8th kill streak (EMP Blast) and this guy's AA allowed him to get away, I had 4 bullets into him with the Nova and he slithered away from me right as the game ended. Shouldn't the EMP Blast take out AA as well?

If he had no armor, then his AA will not activate, and hence, will not save him. It's possible the effect of the EMP had already finished, or that he just spawned, which, since EMPs are a one time thing, and not ongoing, will refill his armour, as it normally would.

This happened to me when I was running around solo in some tdm and right when I emp his auto armor saved him and he jumped away was annoyed :/