Despite the likelihood that Oswald wasn’t even there, had he been he wouldn’t have been dressed for ninja warrior. He would have been wearing late 50s/early 60s loafers. Not Five Fingers or Nike Airs.
60 meters. Sharp turns. Four storeys. Eight flights of stairs. Normal breathing. Not overtly suspicious in appearance. Or shaking from just pulling off the crime of the century. Calmly sipping a soda.
Plus, the shooter also took the time to neatly space three expended cartridges in a row all facing the same direction. That means they gathered them up after pulling the bolt. More time burnt.
90 seconds isn’t long. Seven is even less.