My view is that 2 seconds is the amount of time most people will simply stand perplexed at what's happening. And then the suffocating begins...
Yet here, with no visibility whatsoever and stumbling over collapsed or into panicked people the whole establishment is evacuated in 2 seconds?
That's just what I have trouble believing.
But you're the GM... If you say they did fire drills with full smoke effects and audience every day and the whole being gassed and causing chaos thing doesn't slow them down... Okay then.
4 shots normally take Rafa 2 seconds.
Okay, I can get that you say "well, there's a lot of chaos, so taking aim on those shots takes a bit longer". But then that should be taken into account, no? Then those shots are carefully aimed shots instead of snapshots, no?
Anyhow:
8 Agi, 4 Skill, +2 smartgun, -2 visibility (12d6.hits(5)=4, 12d6.hits(5)=5, 12d6.hits(5)=3, 12d6.hits(5)=2)Though to be clear, Rafa's original "plan" was based on simple RAW, where he'd be shooting 12 dice and the guards would be at 0 dice defense...
Since this is different now, if there's a way Rafa sees an opportunity to stop them with more reliability, like standing near the exit and just hitting on the head of every guard-looking guy trying to squeeze past, that seems easier. Heck, he'd get those attacks as free actions.