Originally posted by Draco69
He could. However according to the premise. Superman is just gonna stand there stupidly and do nothing. For god's sake, even the most trace amount of kryponite has an adverse reaction to him. He won't just stand in krypto-rain like nothing's happening. He's completely underrating Superman's intelligence. Superman's super-genius. He builds stuff that would make Iron Man look like an amateur.
It's not just kryptonite rain, Beast has also set up red sunlight and krypton radiation signature emitters on the battle field. Basically, they set a trap that more than levels the playing field. He'd be bombarded with his weakness and in no condition to simply zip away.