Analyzing the Promo for PLL: s04e13
It looks like Aria and the liars see something. I believe they are spotting Ezra at this point.
You can tell by the way Aria is standing, and the way she turns that she was just talking to Ezra but something else catches her attention.’
So, I don’t think Ezra is going to be dangerous in this episode. He is probably just trying to explain why he is even in Ravenswood. But something else happens that makes all the liars turn away from him, which probably means he isn’t threatening to them at this point. They probably don’t know he is A or his possible connections to Ali.