ok i've been watching a lot of the keirin videos and it looks like in some races during the bell lap a rider will break early in order to pull another rider round then dip into the cote d'azur to propel that guy through to win, falling himself all the way back to dfl in some cases. since keirin racing's not a team sport what advantage is there to that tactic? it's also alluded to in the josiah ng keirin school account, but not explained at all. can somebody?