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Message: [QUOTE="CL82, post: 4226090, member: 44"] There’s a couple of things happening, the first is that Kaulkbrenner was prepared for it and braced himself while Hawk did not see it coming and the second is the difference in mass between the two of them. Many years ago I was on the beach talking with a buddy of mine and a girl chasing after a frisbee ran into me and hit me squarely in the chest. My buddy starts laughing because I didn’t move at all and she hit me and fell to the ground. I didn’t see it coming so, I wasn’t bracing myself, but she was pretty much half my weight. This is one of those cases where size matters. Another way to think about it is think about how the impact was different for each of their brains in terms of change in velocity. Kaulk was standing still and then moved maybe a foot slowly. Hawkins was running at full speed in came to an abrupt stop. His brain kept moving forward just like a person keeps moving forward when a car stops abruptly. [/QUOTE]