Rules what is a Catch and what is Possesion?

A CATCH occurs when a BALL SCORED over the TRUSS by a ROBOT’S ALLIANCE partner is POSSESSED by that ROBOT before contacting the carpet or HUMAN PLAYER.

So If A throws over the Truss to B and the ball hits the top of B how long does the ball have to be there to be considered possessed? Will there be instant replay to determine that the ball was possessed and not simply deflected?

So what is possession vs deflection in an assist? Same question really: If A (zone 1) passes a ball to B (zone 2) who is stationary, the ball bounces off B to C (zone 3) who scores , is that 30 points since B never really 'possessed' the ball?

Hopefully, when the rules Q&A starts up we will get some clarification.