Metal Gear Solid Delta: Snake Eater Bosses
The Pain
There are 2 methods to skip this boss fight. You can find both examples on the glitches page:
https://metalgearspeedrunners.com/wiki/doku.php?id=mgsdse_glitches#air_walking_glitch
Phase 1 - similar to HD possible as shown by Bradderfield
https://www.twitch.tv/videos/2550984476