Originally Posted by nachtflug
good question. my guess is that if everyone is "ok" and nobody is down and incapacitated they won't red flag it. I'd be willing to bet 10 seconds after it happened practically everyone was either off the track or back on the bike and running but again I've never seen an entire gate come to a full stop. very weird. red flags seem to be more for when someone is down and not moving.
There was the red flag last year (or the year before) when I think someone crashed. The riders, announcers,etc... had never experienced it before so it's exceedingly rare. It was a single file restart. Strange.