You need to be much more specific, what EXACTLY are you trying to do?Make ALL projectiles bounce AND change how they bounce? Make only certain kinds of projectiles bounce differently?
He wants a projectile that deflects back to the person/brick firing it.
So basically you want a sonar wave projectile.
Yea, didn't you look at his wonderful diagram?
Those took me hours to make :C
5 seconds
The math in question is very easy: vectorScale(%originalVector,-1);