I get it this time. The guy is in a car and he’s being chased? So…better use of the proximity effect of the sirens. The context makes sense this time. But now the helicopter is too close. If your camera is focused on the subject that got in the car, that is the only way it makes sense of the sirens and gunshots be at the source.
Now your problem is the Helicopter is too close, and at 4:47 you pretty much cut it off cold turkey. If the idea is that the character morphed/teleported back to present time to then assassinated Dr Hawking, then you need some kind of sweeping filter effect, or some kind of zapping sound to tell the listener he made a jump though time.