Big Bruvver, Or Community Action?

A few days back, there was a brutal attack of two gay men in Centre City Philadelphia.   The key evidence in the attack is a video showing a group of about a dozen white men and women in their early 20s who are "clean cut" and well-dressed.
These are type of person I am expected to trust with a loaded firearm in a public place.

Anyway, the victims were able to identify their attackers from the above video.  The case was broken  after a Twitter sleuth identified the mob via photos and their social media accounts.
I should add that one of the victims lost his bag, which included a cell phone and credit card that was picked up by one of the women in the group.
Now, if the person who had lost his bag had a gun, would he have had the time to have used it?
Of course, despite this being a brutal attack, the people involved may not do jail time.
See also:

• Sources: Alleged attackers claim mutual fight, not attack, on gay couple in Center City Philadelphia | 6abc.com
• Joe. My. God.: PHILADELPHIA: Multiple Arrests Expected In Brutal Mob Gay-Bashing Case