Perp was behind the gabled roofline (ridge) until the last moment. I don’t think the snipers “above” Trump saw the perp more than a second or so (and not in their scopes - watch the closer sniper look up from his scope) B4 the assassin fired.
The 5 shot volley almost certainly came from nearer the building the perp was on — in the vid taken there, those 5 shots were much louder than the shooter’s shots.
Curious:
Has Trump, the Trump family, or the family doctor made a statement about his condition?
If not, why?