Video of the carbine reload glitch @Dersky https://youtu.be/OFn8q99yI1E
I don't think this is a bug - in my opinion, what o Bushwick
has performed here is a "doubleshot" (RRX), one of H2's later-found 'pro tricks'.
DeRsKeezY, with your background I'm sure you already know most of this, but for everybody else who might not know:
By pressing R, and then R and immediately X, this gets two shots off quicker than they would normally be possible and also initiates an animation-less reload.
As o Bushwick was testing the firing speed and then reloading, it looks like he timed the RRX well enough that it worked.
Doubleshot was generally used in competitive play with the Battle Rifle.
Pressing 'YY' quickly between "RRX" cancels the animationless reload, and quickly allows you to "RRX" again.
RRX-YY-RRX (quadshot) is enough to kill a fully shielded player extremely quickly.
It is difficult to do in game, but very rewarding if you pull it off, and can be used if an opponent gets the first shot on you as a way of clawing your way back in the battle.
Can also be used R-R-RRX, normal shot, normal shot, doubleshot which will kill if all shots land.
I didn't get an invite to this flight, but this has been in the game since H2X's original release and is in MCC - heres a video I just captured in retail version of MCC
I'm rusty.. it's been a few years - Apologies for the phone video - my upload studio is being screwy
What you see in the video is:
-A few double-shots(RRX) with the BR (with some YY's in between)
-Carbine firing and carbine doubleshot (RRX) showing exactly what o Bushwick experienced (normal)
After that, I've also shown you an RRY, requiring similar timing, but getting a second 'phantom shot' delivered after you swap weapons.
You can do this to yourself if you are walking, and if you have no shields you will be killed by the guardians.
RRY is another pro-trick, if you have a secondary weapon, RRY'ing your second last shot before switching to your secondary, if timed correctly, will get a phantom BR shot on the enemy which means they still take damage while while the weapon change animation is playing.
You see this on the last one where I switch to Carbine and my second BR shot comes out just before the carbine starts firing.
I just want to re-iterate - all of these button glitches exist in the retail version of H2, and they are some of many that form an integral part of how H2 was played, particularly competitively.
EDIT: Back when competitive Halo was huge, Toxic Euphoria was probably the best at this in the world.
Here is one of his montages, it is so hard to fathom the intricate skill involved in a lot of these plays... The sheer number of buttons pressed all in perfect time, he was a true master.
Please leave this as-is!!!!!!!!!!!!