So Trump's gut had him turn his head according to this. I mean it's plausible, the sniper team on the roof had put down their binoculars and aimed their rifles towards the shooter at least 42 seconds before the shot. People in the crowd would have probably been turning to look that direction as well. Trump happened to look that direction as well to see what was up and by doing so at that moment dodged a bullet.

I still prefer divine intervention/miracle as the reason