The curtain issue needs to be decided during re-game. The closer it goes down to the ground, the more likely it is to be a "wall". The higher it stays, the more likely it is to be "ceiling."
I think the call only belongs to R1 -- but, especially if it's away from R1 and R1 might not have a good view of whether the ball actually hit the curtain or whether B1 played the ball before it hit the curtain, R2 can provide help.
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