Never start a fight that you aren’t prepared to finish, especially if you run the risk of getting knocked out with a street sign, WWE-style. The guy in the black T-shirt not only screwed up by introducing a weapon he wasn’t prepared to use into the fight by knocking over the street sign, but made the fatal mistake of putting his hands on the guy in the white T-shirt’s lady friend. Big no-no. Sometimes you’re looking for a sign, sometimes one just appears; safe to say the latter happened here.
The only good thing the guy in the black T-shirt has going for him is that he got slept in a crosswalk, so pedestrians and cars will take care to avoid him until he comes to.