The time between killing the last santa-slave and the mission ending is greater than the time limit for being booted.
Which is stupid. If you don't keep running in circles after everything is done you wont get a prize, even if you're in first place with over 4000 points.
yeah i got in trouble with that yesterday. the other two people got booted right before the last segment, and of course i just stood there like an idiot waiting for the timer to go down. i got booted!