Robinho doesn't actually look like he has thrown a punch, looks more like he has a struck a pose which is intended to say "I know karate, don't mess with me!"
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Perhaps Grav is tough in the way Ross Kemp is tough - looks it, but is probably soft as butter underneath.
As for the whole punch-up thing - it just sums up how useless footballers are when it comes to fighting - I have watched loads of these things over the years, yet have never seen a punch landed!!