I had a lot more to say, but instead, consider this, Collins is putting everything she has into just trying to slow down the vault door and pillar. She can't stop both, or even just one, and she's forced to choose to try to hold them as long as possible to try to save people even when she knows Pheonix is about to knock the shit out of her. Ocean just negates the pillar with "a flick of the hand," like it was nothing.

I'm not asking or telling you to edit your post, we'll probably just leave it as is. I'm asking you to give more thought to your character and his limits, what he can and can not do, what tires him. Moving water requires energy if you want to be very hardcore about it. Energy goes into increasing the water pressure enough in fire hydrants to get them to explode, and so on.