Finish the race get off the track. Period. There were not one but two riders I believe at Laguna Seca one year who incredibly decided to come to a near stop ON THE TRACK just after crossing the finish line. I say incredibly because, wtf were they thinking, they finished the race near the front of the pack and HAD to know there were laggards/back markers coming up behind them. I've seen the crash video of a rider at full clip slamming into the nearly stopped other rider.
Finish the race get off the track. DONT STOP or dramatically slow down on the track at LEAST not close to the finish line! Sheesh its like taping a sign up on your back that says HIT ME HARD AND FAST.
I feel sorry for the guy and his family --- only a few seconds of poor judgment then it's over. Very sad.