[justlurking]

Use of combustion is not allowed -- i.e. they can't use a cannon with gunpowder.

However, certain classes use compressed air. If a tank ruptured, flying debris could seriously injure people nearby.

Some of the classes use centripetal force, and a spinning mechanical device could fly apart.

Finally, there are classes that use stretched bands (ropes, etc.). A failure in a stretched material could cause serious injury.

[digger48]

A failure in a stretched material could cause serious injury.

That was Harry Roids excuse. Beat up by a rubber band. (named Guido)

[Cboldt]

-- A failure in a stretched material could cause serious injury. --

Harry Reid will testify to that.

From "explosion" I take it as a rupture in some pressure containing element, could even be the barrel.