If in a situation like that, it is best to avoid confrontation. Run if you need to.
When I was a youngster in high school, a group of about 15 guys surrounded me and two of my friends one time when we were downtown. A fair fight was not gonna happen if we started to win. So we walked, maybe even ran, away. One of my buddies, Tha, was a pretty highly trained fighter, and I had a fair bit of experience too. But we knew we would be swarmed.
So you would think that was the end of the story, right?
As luck would have it, only a week later we bumped into two of the main dudes who were instigating shit with us at a dance.
Remember dances? Tha fought the one guy right in the middle of the dance. Kicked him around a bit. I squared off with the other guy and kicked him hard just above the knee (a Thai boxing style kick with my shin). The pussy kinda spun around and turned his back to me and I took a few steps and kicked him in the kidney area with a jumping side kick (which is not a weapon I usually use but I would dink around with it sometimes). He stumbled forward and fell and by that time the lights were coming on and people were screaming...
pandemonium!! We left the scene.
So you would think that was the end of the story, right?
A short while later, I was picking up Tha's younger brother, Nya (who is actually my age), from his job at a Chinese Restaurant. Who did I see walk into the restaurant? The guy I kicked. He was using crutches. I asked Nya
"Who is that guy?" Turns out he was there to pick up his mother who works with Nya. His mother told Nya that her son was beat up by someone (me) and his knee was severely injured. The guy's buddy had his jaw wired shut because another guy (Tha) beat him up. Tha kicked him in the jaw at least once that I saw, and I can tell you that when Tha lands a kick, it is powerful. So I tell Nya the whole story. He got a good laugh.
That is the end of the story.