It's funny that I hear people saying don't break eye contact.

Where I come from if you look at anyone long enough they will start a fight with you on the basis that your challenging them. Like animals do.

I had a fight with a guy over a woman (yeah I know)

I was 18 he was about 30. He took off his jacket and his watch and it made me think, shit this guy is too relaxed, what does he know that I don't?

Third punch he was out for 5 minutes, I even helped him up. He was a high class business man trained to look dominating and powerful. But he was a wimp at the end of the day.

Body language can be fake in every case