Ah he thinks, with a kind of incredulous longsuffering quality he mostly ascribes to Alfred, and does not dart away - instead he flips through options for what he'd do if anyone got a decent throw hold on him (and Clark's, while far from form-perfect, counts purely because he might break his own arms trying to get out of it). If Clark were human Bruce could twist to one side and get him in a headlock, or simply not move. He opts to let gravity do the work, allowing himself to fall back, but keeping hold of Clark's borrowed shirt at one shoulder and a grip on his other arm.

In theory, this will allow him to roll back and throw an opponent over his head, and away. He's curious as they go down what exactly will transpire. He suspects Superman might not have the ordinary vs-gravity buoyancy to be flipped.