he isn't just inside the door when he lets the jets off. He is quite a way inside the corridor. But, if you look at the shot when he lets off the jets of smoke, the first few frames has him coming to a halt. We also don't see him for a few shots after he opens the door. He may just have popped outside to check if the coast is clear. lol. Then heads back inside to provide cover for the team. This could easily have happened in the moments that we don't see him.