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But what was the original argument here? I can't see how what your hands are gripping onto affects skidding / pedal breaking?
The distance between your hands? Position of shoulders or upperbody? Good grip?

distance between your hands and distance from your knees. HUGE factor in pedaling when out of the saddle. Similarly, if you're riding a fixed gear, it makes a difference when slowing down quickly as well.

wider bars give you a lot more leverage to pull the bike into your pedal stroke, which you should be doing when standing.