I accidentally fell into that scenario the other day in Skywatch while hunting Blades for Eris. I sat in front of that room with my OM and BJJ and just wrecked shi# for 5 minutes. Probably got off 8-10 novas in that time and I don't think I ever reloaded. Not much to show for it as far as rewards aside from a bunch of green and blue engrams and a floor littered with ammo but it was amazing to be able to do that.