Bass Guitarmos Knights is the boss of Gerudo Ruins.
Bridge and 1F Skip
You can skip the gears and 1F by swimming through the lava with Goron Locket and Flippers.
By combining Hover Boots with knockback, Pegasus Anklet or Cane of Somaria you’re able to skip the gears.
hoverboots bomb gear + gerudo skip, optimised movement pic.twitter.com/6oBShhtBo7— Dryvnt (@Dryvnt) June 17, 2019
While Freddy is a ghost, he hovers over lava and as such is able to skip the gears and 1F.