I don't see why widening the field would result in any increase in the relative velocity of opponents hitting each other; I don't even see why it wouldn't result in a reduction of same. I mean vector-wise, which is the right way to think about it.
Consider for example what it would be like if the field were only 10 ft. wide. Practically all the motion of opposing players would be directed against each other. Give them more space to run sideways, and more of that motion will be so directed, rather than forwards. They'll get up to higher speeds, probably, but at lower relative velocity.
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