Lets say draken blitzed the guys themselves which would be evident consider their reactions and the events after and lets say he did so from even just 5m away then
5m/.0291= 171.821306 (Subsonic+)
And yes its possible to have blitzed the guys and been there right before they pulled the trigger that would just be him arriving before they react pulling the trigger all the way back thus negating the need for him to have blitzed the bullets and considering the surroundings again being fairly open at the part of the amusement park they were at you'd have to assume Draken traveled at least 5m to be away from any obustructions still even on top of that assuming he came from a certain direction and which adds another layer of assumptions we just dont have.
I just think its safer to either not use the feat at all or calculate it as draken blitzing the guys and not the bullets cause otherwise you'd get some outliery stuff see let me use values from your blog below
vsbattles.fandom.com
1.27m/450m/s = 2.82222222 milliseconds
5m/2.82222222 milliseconds = 1771.65354m/s (hypersonic) which would be an insane outlier in which case making the feat invalid for use anyways cause if these guys were hypersonic then not a single one of them would consider guns a threat and could honestly bullet time them