(Entry for the 72 Hour TF2 Jam)
Have you ever tried playing Pyro Tennis with rackets instead of airblasts? No? That's good because these rockets explode on contact with about anything, if you didn't know already.
Thankfully, to ensure that the match is not one-sided due to instant death of the one who serve, we at Mann Co. created the finest piece of racket made of a special kind of string that has been designed specifically for that very sport.
Just swing that thing at an incoming rocket and send it back to your opponents' face and proceed to shadenfreude over his soon-to-be pile of gibs.