To me it didn't look staged. It looked like a genuine reaction, and one that I have seen many times. Yes, it was an extreme version in that he landed a much better punch than most would if startled. As Jim said, take it as a lesson. This can happen any time you scare someone.
I can deal with startle punchers. It is those who think it is fun to assault the actors that get my goat. Interestingly, it seems to be women almost as often a men who act this way. Pathetic.
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