Legal or not?

[Warrenkicker]

Because if the ball is in the air toward A2 he is obviously not a potential blocker. If B is just trying to get past A2 and contacts him then I don't have anything. If the contact by B is intentional then he risks a foul if A2 is not trying to be a blocker. If A2 is looking to catch a pass and is behind the neutral zone then he can't be interfered with but he can be contacted illegally. In this case it was a push so holding is not the answer. Illegal use of hands is the only call left.