Paper cuts and broken glass! Nope, terrible plan. There are many terrible ideas available here. For lack of a suspiciously convenient weapon he doesn't know how to use, he will investigate these funny feelings he doesn't know how to use either. Concrete floors are weirdly gentle. His vision seemed to be working better looking around the room. He's in general feeling in really good shape, not even taking into account the recent suffering.
He picks up the mop and hefts it and swings it around, noting the ease with which he can control where it goes; not a single shelf has been whacked yet.
— after a minute there's something else. This funny feeling is in his grip on the mop handle; it's feeling less like something he's hanging on to and more a part of himself, and not just in the way holding a familiar tool is like that. He lets go and there's still something; it's like he feels the mop coming to rest against a shelf even though he's not touching it. And there's something about his hand…
Actually feeling silly for once, he makes like a Jedi and tries to pull the mop to his hand. It doesn't work, but it feels like it could have, like there was a twitch, that he hasn't got enough strength to do it. And his hand catches his attention again — he can feel the inside of it, not in the usual way but the structure of skin and muscle and fat and bone and blood —
There's a lot of stuff here. He takes the mop again, sits down on the floor, and sets to exploring it all, because it seems like the best chance of having any control of his situation. And being a superhero, that too.