i can see why you wouldnt want to fire either of the 3 inside a building but it has been done in real life. i was just reading in Patton's Vanguard that during the battle for Singling, which was highly documented by the 4th AD that some of the infantry did so. A pair of assault guns were waiting around the corner for shermans to pass by. but some of the infantry spotted them before and warned the shermans. they decided to take a crack at them with bazookas from the attic windows. one of them wouldnt fire and the other they fired 3 times. only to have the rounds bounce off. pesky panzers.