Since I'm operating under CBR rules I'm dismissing that showing of Cap vs Prometheus for two reasons. Firstly: It's completely insane to see Cap one punching someone of Prometheus' level as anything less than a PIS-induced victory and secondly: Crossovers don't count since characters are usually misrepresented in their capabilities.
As for your second point; If the first projectile is a sonic grenade or a flashbang Steve isn't going to get the chance to stop Bruce from using another since he'll be unable to defend himself for several seconds while Bruce can pretty much just beat on him as he wishes.