The thing that could become an issue for Trump and maybe his future excuse for something is the reason a streak from a bullet was captured in a frame on camera. High velocities like the NATO 5.53mm generate significant shock waves on travel. These waves alone can be powerful enough to cause physical damage to tissues. Obviously this is in highly close proximity. Trump will have felt a solid thwack on the skull from the shock wave, probably not pain, the energy of which went into his skull. It may be that his brain, already age-shruk, was protected better than a younger man but TBI is a real worry.