Well, here's my take:
You throw a very good ball and have very good form. Nothing wrong with your physical game that I can see.
Your friend also has a solid physical game, however, the only thing I see that may give him problems is how he wraps the ball around behind his back. That can cause inconsistency and balance problems.
Other than that, you guys look pretty good!! Keep it up!!
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"Why cant I just throw the ball the same way EVERY TIME??