What can I do if I accidentally knock the block down multiple levels in the Fire Temple?

I am playing the 3ds version of Ocarina of Time, and I am currently on the Fire Temple. I reached the area where you need to use the hammer to knock down a block multiple floors, until it becomes a stepping stone leading to the locked door that needs the Boss Key.

I knocked it down one floor, and then immediately knocked it down again without checking what was in the room. Now I can’t figure out how to reach that room again, and I think it might be necessary to go through that room in order to get to the Boss Key. Is there any way I can reach it?

I can’t just shut off my 2ds; I accidentally saved after I messed up.