players help players
This sounds strange... maybe one of the enemies shoots at him. You could try to move Jack down on the ground. But in fact it should work without doing anything. Try to leave him alone during the end cutscene.
Huh. Can one save during the timed run, I did that. I can't move him in the flyby it starts right after drinking, he drinks by the now broken window serum. Does he use the crystal for anything?