The main part is at :50
http://www.youtube.com/watch?v=SQYFBgw_ewc
Seems a lot of you guys are into eastern philosophy, I know G really is, and one of the things I learned a long time ago from a guy named Erle Montaigue was about yin and yang energy in regards to aggression.
Basically yang energy is pure aggression (The example he gave was with a pit bull, the reason you're afraid of a raving pit bull attacking you is because it's pure aggression and his yang energy is greater than yours, even though it only weighs 50 pounds and you weigh 200, someone will still get very scared unless they can summon more yang energy by seeing the dog attack their child or something), and yin is weak and yielding.
Let's say you're in a fight and your yang energy is greater than theirs, they will yield and submit because of it, but if your give off only "a little bit" of yang energy and their yang energy is greater then yours, they will feed off of that little but of yang energy and become even more aggressive because of it, basically projecting it back on you.
When the mongoose in the video advanced he was displaying more yang energy and the lion submitted (Even though he's like 1/100th the size of the lion), once the mongoose started to run, the lion started to chase because the mongoose lowered his yang. This is the reason that if in the rare instance I get in an argument with someone I go fucking alley cat mental just so I'm sure I have way more yang energy then the other person and it makes them back down and submit, forcing them to be yin...but offer only a little bit and they will come back harder.