I did an outlast run but i may have ended it at the wrong time is it when you open the door and get shot, or when you hit the hand scanner?

Timing starts at the beginning of first chapter, when you first gain control of Miles by the car and ends when Miles' hand first touches the floor at the beginning of end cutscene.

Treat the striped line when your staggering out as the finish line as soon as his hand touches that it's time

ya it ends when hand first touches the floor on the scene before getting shot, I rejected your run since u didn't finish it