Bruce drops his hands from his face and reaches out to let that happen. He doesn't know if he actually wants physical contact-- but he doesn't know what the hell he wants at all. He feels lightheaded and blank. Clark is a focal point of something real, though, and he knows he needs it. Something he can focus on, like keeping his eyes on something still while in a freefall, preventing him from becoming dizzy.

"I don't know why I..." Reacted like this, why I can't handle it, why this hit me so hard.