Like some scene out of a Martial arts movie.
My best mate has a friend who was a highly ranked multi displined martial artist and one evening they were enjoying a pint in a rather dodgy pub. At some point in the night some guy came in with a group of mates and without warning punched some girl to the ground.
While her friends were attending her the martial artist guy approached the group and rather than retaliating, politely suggested that they'd better leave.
He gave appropriate warning to the group of guys and, as he was hoping, when one of the guys started to kick off decided to act physically.

My mate described it as 'There was a bit of a whirlwind lasting maybe 30 seconds or so which ended in all the guys lying on the floor in varying levels of unconsciousness.'
The guy then sat back down next to my mate and carried on drinking his pint as if nothing had happened.

On another note the martial artist guy once bought my mate a birthday present of a Katana Samaurai Sword. After unsheathing it and noting the ease the razor sharp blade cut through various test items he realised it wasn't any old ornamental device and decided the safest place for it would be in his loft out of harms way.
( Airman Gabber Living life like a 70's BBC presenter, Thu 14 Mar 2013, 11:35, Reply)