Originally Posted by Oozer3993
Sword flying was never patched out of the campaign. Bungie specifically left it in because the community had so much fun with it.
After the 1.1 update, it became significantly harder to sword fly because the timing window was reduced. While it is still possible, it is significantly harder to pull it off, and pulling it off consistently with snipers is very, very difficult. The old timing window was easier to deal with, while still retaining some of the difficulty.
This is what I am alluding too, the 1.0 timing window was significantly larger.
This is why the speedrunning community uses prepatch Halo 2 for speedruns.