The failed throw has a leg kick out seemingly on its own, thumping heel back down onto mat in the wake of failure to launch. It could be embarrassing, probably, but it doesn't occur to Clark to feel so. Embarrassing would have been accidentally misjudging this whole situation and flinging Bruce across the room, right after panic at whether he broke him or not.

This is nothing. This is—

"If you laugh," is a hanging threat, anyway. He sees you, Wayne.

Clark slips foot under shin as instructed, takes a short breath, and heaves again.