My local riding buddy Ray (the Baker) and I have been best friends since 1967. We actually didn't start riding together until '74 sharing the well used and abused hand me down MT50 and in later years the mighty TS100. After riding with someone for so long you know exactly how they think and their riding style, you know what you can and can't get away with and when it comes to play racing clashing bars and elbows and running over feet and legs is quite acceptable
We'd push each other near as hard as we could ride but I don't think there was EVER a time when either of us 'physically' caused the other to crash out but we didn't give an inch either
The mind games still get pretty intense though we don't ride near as much as we used to