We had REF several times on our squad. I had TWO reshoots because of that swinging star. (Plates fell into other plates and knocked them off) Since the star was at the end of the stage, I basically shot that stage 3 times.
There is a reason that stars, esp swinging stars, are used sparingly at Majors. I've seen/shot several swinging stars and they have all had issues.
A contraption like that should be used on shorter stages, not high round count stages. They should also be used near the beginning of a stage. They should also not be allowed in anything other than a Level 1 match. End of rant.