CR misses offside flag

[BCer]

phatneff is bang on. The AR needs to leave the flag up, since the CR might not see it going up immediately.

As a CR, I've been given a "look thrice" adage in a recent clinic. On a play that might be offside, quickly look at the AR (apparently many will signal by their body language that offside is a possibility), then look again a second or two later (in case they are simply slow), and then look a third time once an attacker has received the ball to ensure that you pick up that slow flag you asked for.