EG: Montreal, Button collides with Hamilton, there is no immediate safety car, but Button has a flat tyre, he is now in last and quite comfortably so, by the fact he has to nurse the car around the track, Hamilton parks up well down the track and in a position which brings out the safety car, saves button who pits, and gets a tyre change in the process, he catches up,...the others pit and Button goes from well in last possibly contemplating retirement....to like 10th under the safety car, which he contributed to? if the safety car comes out, he can pit but can only be released after the safety car passes again...effectively maintaining the +1 lap deficit.