Respectfully, because we do not know the details. Assumptions made. The guy on the roof is dead— by whom? Trump’s detail is handpicked, not the C or D team. Beyond that won’t say more, any more than would speak to the large private security.
Who “hand picks” a short female to physically cover President Trump? She is certainly brave but a head too short and left a clear head shot target if the shooter was still active after he stood up.
A witness saw the gunmen have "his head blown off" by SS sharpshooters.
Bravo Zulu to those men.