Every flagman needs to watch that video several times. Learn how to position yourself to stop as much of that as possible. Probably not possible to stop the first few hits but the later hits should not have happened, a flagman in the right place could have prevented several of those hits. Not just the flagmen I know, the track officials need to do a better job of placing flagmen.
That was on live TV and it seemed to take forever for the bikes to quit coming over that jump, I was shouting at the TV for a flagman to get on top of that jump.
I never shout at the TV.