https://youtu.be/oNj4UjzbHkQ
Actually, if you look at the video, Ozy only really needed to move his right hand around 1.5 feet. Just raising it enough to catch the bullet aimed at his chest.
Distance of the shot looks to be around at least 6-8 feet. Proof: at (0:10) he falls down and SS is nowhere in the shot meaning she was far enough back to be covered by the pillars. This then means that his hand only needed to travel no more than 1/5th-1/4th the speed of the bullet, likely less.
Meaning that since a standard .38 special round has a muzzle velocity of 494, then Ozy likely flicked his limb at mph 98.8mph-123 mph tops.
As for perception speed, h1 claims that Ozy percieving the bullet is the only possible explanation here (and will likely not accept any other explanation), but it is just as likely (and more accurate to his characterization) that Ozy predicted the exact moment SS pulled the trigger (reading her facial and finger twitches, etc) and simply moved his hand in that exact moment. Essentially, timing the exact moment of the shot + aim blocking.
Of course, he will also be the first person to yell "aim block" when talking about WS blocking "feats".