BR collides with F3 after catch

[DTQ_Blue]

Tru n Blue, I read the casebook play (thanks for pointing it out). In that play, the runner, R1, committed to try to score before the BR acted to prevent F3 from making a play on R1. Clearly, the BRs action adversely affected F3 in making that play. In my game, R1 was going nowhere when that catch was made by F3, i.e., no play was in the offing. So the collision did not hinder F3 from making a play on a runner in motion like the casebook example, rather, it allowed R1 to go in motion.