Weren't most medieval/post-medieval fuses made of saturated hemp/cotton rope. Matchlock fuses were highly susceptible to water. Rufus seemed to describe a wheel-lock type device used to spark a fuse, so i'm assuming roughly that era of technology.
If it was a modern visco fuse, I think water wouldn't do much.
If I blow up in a ball of fire, I'm coming back to haunt you guys as Captain Auerswalder: Winter Soldier.