Raposa 'tis a strange one. There's another video of the incident from inside the bar/restaurant and English & Serbs are happily & friendly drinking and eating together. There's a group eating in the window a seats wearing England shirts, so it's a strange place to attack if it was England fans (which it does appear to be) outside.
It also seems that a good number of the Serbs were special forces/ex special forces/could do bits & pieces, as the President's son was there, and they were looking after the cheeky scamp.
If you've taken the trouble and cost to dress yourself head to toe in Massimo Osti's finest threads and you get knocked about into a bloodied & confused state by a chap in ill fitting tracksuit bottoms, white t-shirt & slip on trainers, I think that it's time to consider your life choices or at least properly prepare physically for your chosen leisure activity.