It's just a fair warning. She wouldn't want to him to blame her, when he's drenched.

But nevermind that now, she's busy. It takes much of her focus, to be able to channel the water this way, building the pillar of water, more and more. Challenge becomes difficulty. Difficulty becomes strain. She's gotten him up a good ways, much quicker than if he'd climbed. At least two platforms distance, without having to worry about the electricity. But it's like lifting a heavy weight, when you're not completely ready. The water under him starts to loose its firmness.

"Jump!" She shouts. Much quicker than trying to explain. Just get off, before she can't hold it anymore.