What if you Make a Cannon for the "Human Cannonball" and have the legs sticking out of the end? This is for fun to show that he is stuck and facing the wrong way. If you can add the effect of the wick being lit that will add some more effect.
I have two kicking legs props (bought one for a back up a few years back from Spirit on clearance). For my carnival I was going to go the cannon route with one (easy to do with sonotubes from the hardware store for the cannon barrel) and the other one I wanted to use with the sawing a man in half act.
One of these years I hope to do a carnevil theme and planned to have my kicking legs dressed as an animal trainer. I was then going to make an elephant leg sticking through a tent flap stepping on the back of the hapless trainer. If I could make it work, I was also going to have a trunk swinging back and forth through the flap.