I noticed the same thing when
I used to go to matches. Some R/O's called it, and some were just kinda there...... some said "Don't do this, because ....." during the walk thruough, and then ignored it during the match.
I always wanted to have a plaster lathe on a pivot rigged to fall on an offenders hand/gun..... maybe with "CHOP! CHOP! CHOP!" written on it with sharpie.