I witnessed the test in question.
There is a big difference between bounce and a light trigger.
when hitting the back of the gun, it fired one shot, the question here is how hard are you supposed to hit the gun (i.e with a hammer, most electro markers will fire or explode
)
At no time did multiple shots fire from the marker, therefore even on this test, the marker did NOT bounce.
In hindsight, that marker (IMHO) should have been allowed on the field, but in the spirit of MM we let it lie, and used a kindly donated Imp for that game.
This is not an attack on the ref in question, just an observation that the terminology used is subject to individual's interpretation, and should be clarified by MM to stop this happening again.