That is crazy! I wonder why he did not press charges?
EXACTLY my thought at first reading.
Any such violent, bullying behavior HAS to be reported officially and charges pressed--After all, despite what we see in movies and on TV, those of us who are trained in self-defense are NOT permitted to use even "equal force" to defend, let alone administer ANYTHING in the way of "punishment" there at the scene (and you can BET that the embarrassed bully(s) will themselves do so--it happened exactly that way to me, when younger: and of COURSE the THREE young "NOT-so-toughs" who'd been gleefully assaulting whomever they pleased around that bar before coming to a quiet young student drinking alone, myself, and had the tables TURNED on THEM, THEY brought charges, criminal AND civil, on ME--and showed up in court with mommy n daddy, lawyers and crutches and slings and the whole drama to paint a picture of THEMSELVES as the "victims"...ONLY the fact that they had pissed off so many folks already in that bar that night that MY attorney was able to contact and suppoena witnesses to appear at the hearing and contradict their testimony, were we able to get the whole thing dropped and the process reversed-- with the complainants subsequently, ultimately counter-charged and having to negotiate their way out of going to jail and/or having assault convictions on their records--so THIS one came out OK, but ONLY because of citizens ACTING upon their righteous anger and right to justice).
Whatever the details surrounding such an incident, though the "average law-abiding citizen minding his or her own business" invariably just wants "PEACE", once this sort of "misbehavior" comes your way, it is now your "civic RESPONSIBILITY" to see that the miscreant(s) somehow ANSWER for the trouble they foment--and given the point I make above, unfortunately that usually will mean YOU GETTING INVOLVED, and (carefully, calmly, if it escalates IN SPITE OF YOUR REASONABLE TONE AND WARNINGS) having any person on the scene whose JOB is keeping the peace act to either cool things out or call "the authorities". A shame that it has come to that sooner and more easily these days--but given cell phones, social media, and the daily headlines we've all seen ad infinitum, "discretion is the better form of valor": Walk away, or get the cops.
Or, as my first (civilian) cenci put it way back there my first day at Thai Quan Do: "Your first and best weapons are your voice to say "I'm sorry" and your legs to RUN AWAY!"