Im not saying anyone should beat up on anyone, im just asking why anyone would just "take ukemi" if nothing happened?
Perhaps it's more of a sympathetic movement exercise then?
On proper trigger control (http://http://www.rifleshootermag.co...05/index1.html
): "The thumb and index finger work as a team, and this teamwork is in use countless times in a day (pick up a coin to see it). Technically, it's called "sympathetic movement," which means that when one moves, the other is ingrained to move also."
This last part seems to fit. Of course it can be either bad or good, but considering the idea of harmonizing with other people's movements, maybe there's some value to it. I've personally found sympathetic movement to be pretty useful.