Finn's not afraid, but he knows he would be were he his old self. Not just for himself, but Jonathan. That thing better not be as powerful as an actual dragon, or dragonborn.

"We need to get you a blunt instrument. I can distract the thing while you break the leg off a table or chair, perhaps. There might also be something in the supply closet," He nods to a nearby door marked as such. "Or you could just throw things at it."