newton's law of motion
http://library.thinkquest.org/10796/ch4/ch4.htm
simple laws constituted in motion shows that with each action is a reaction. If that reaction includes more weight, that reaction will be equal. Therefore each hit they make has an equal effect. And therefore, trayvon martin's hit would be less heinous and less of a threat.
That's all it's a scientific law. I just was saying that's where my thought process relies. And not just that. I remember I bumped this old women I was yes taller than but was at least 50 lbs heavier. I bumped her she was at least 60 and nail me to the wall. I couldn't get away because of her weight despite she was old and cripple. I've also noticed with other average sized women when they bump into me I easily get bruised because their heavier weight. That's what I'm saying less weight less mass creates more chance of injury... It's the reason men are stronger than women...