Couldn't agree more with Chris above
Does it look bad? Of course it looks bad.
However, if all the reports are true and these guys have tried to attack Stokes/Hales/Anyone with a bottle and Stokes has the guts and power to finish it then good on him, the guys got exactly what they deserved.
Of course the video looks bad, they have only shown the footage of Stokes. Don't forget this is the Sun that has put this video into the public. Who knows what other video evidence they have been given that they haven't shown?
Its all well and good sat typing on a forum saying he should do this, he shouldn't do that but until you are in that situation you have no idea how you will react.
Just put yourself in the position of you being outside a club and 2 drunk idiots coming and attacking your Mrs/friend with a bottle. Would you just 'leave it' and walk away? Should he have just left it? Yeah probably in a perfect world, but it isn't.
As Max would put it "Play with feathers, you get your arsed tickled!"