In the video below, I outline what are arguably the two most salient issues with moving to a handgun threat at the head during redirection.
The two issues, (1) the line the redirecting hand takes to the handgun and (2) the timing of the hand movement relative to the movement of the head in creating a “body defense” that enhances the removal of the immediate danger (that being the muzzle of the handgun inline with the head) are critical for success. Check it out!