And it ain't just Pacquiao flicking. He puts serious power behind those blinding flurries, unlike 98% of the guys who shorten up and let their hands go.
The guy is a great fighter but I don't know why he shadowboxes like that. He looks like a spastic. Anyone could flail their arms around like a buzzsaw with no regard to technique or form. The footwork and the arms are completely unrelated to each other in that display. To me it looks like martial arts rather than boxing. But then again Pac defies a lot of boxing's technical orthodoxies with his style.