That wasn't because of his boosterware - Morgan is exaggerating for impact. Sure the 'ware let him get his hand up in time as the other guy fired, but as Morgan says, it's a one in a million chance to do it time and in the right place.
That was a Luck roll and a few tens.
Combat sense doesn't mean you physically move faster - it means yo have a jump on getting "hot" while the other guy is still coming to grips with things. Bullets going by don't check against combat sense.
Outside gene modification - a process highly unlikely to have been available when Morgan was serving - and FBC, boosterware can get an already-fast person's REF to 11 and init boost to 13. 14 with Sandevistan but that takes 3 seconds to come on-line.
So you're fast. But Ref 13 is only 2 to about 3 times as fast as a normal human at 4-6 REF.
Ungodly quick compared to you or I, but nothing like the speed required to have your hand come up and cover a foot or two of space and intercept a bullet travelling at 1300 feet per second goes by from, say, 20 feet, ( which is unlikely - crowded bat, it would have hit someone. 5 feet is more likely). That bullet covers twenty feet in 1/65th of a second, ten feet in 1/130th of a second, 5 feet in 1/260th of a second.
So, although your super fast guy might get his hand up in 1/10th of a second, ( trying doing that up and down 10 times in a second for example of how FAST we're talking), he is hopelessly outclassed by the bullet.
Why, yes, I had the same argument as you did Mac, long ago. This was my Refs response, minus the exact math.
I am not sick of bullet-time at all, though. I still like it. I also can't see a good way to represent super-quick reflexes relative to people around you.