Sorry, I still not understand. After I press rt (web zip), and get close to the enemy, but there has no reaction for press any attack button (x or y button). The enemy only hit by the rt (web zip), when I use web zip to get close to him.
Any other easy method to complete the "zip kicks" challenge?
As long as an enemy is standing on a platfor that gives you the webzip icon he should automatically knock them off when you zip to it. The easiest part to do it on is when the snipers are standing on the pillars zip to the pillar and he will kick the sniper right off.