Concacaf refs make up rules as they go. Let's just say for the sake of arguments Besler did kick him, that wouldn't be a yellow, it would be a red. The ref didn't see anything happen, so he had no right to issue anyone a card (even for diving). Instead this happened:
"I didn't see the challenge, and have no idea what happened, but I'm going to give a yellow card to the defender anyways"