Interestingly, Trump's statement after the incident seems to support this. When I initially read it I thought it was odd that he noted the whizzing first, but it now makes sense.
"I knew immediately that something was wrong in that I heard a whizzing sound, shots, and immediately felt the bullet ripping through the skin"
"I knew immediately that something was wrong in that I heard a whizzing sound, shots, and immediately felt the bullet ripping through the skin"