"You went through shit. Makes sense." It's hardly a judgment, after all. Hearing the water run, he glances back over his shoulder before turning back around, watching Finnick for a moment or two, debating on whether or not to offer to help. He's long been in the habit with Erwin to not assume he wants assistance with every little thing, and has to believe Finnick is much the same way. But he also knows that soldiers and people who are used to doing everything on their own often hate or forget to ask for help; he's much the same way, after all.

He also doesn't want to wander away only for Finnick fall on the floor.

"...let me know if you want an extra hand," Levi offers from the doorway. It's not intended to be funny necessarily, but he'll be there whenever the other man is ready to shuffle back to bed - except that he'll deposit Finnick carefully in a chair with a glass of water to sip at while he strips the dirty sheets off the bed and lay down fresh ones. Only then will he permit him to get back in.