The skip at the start can be performed with the following steps:

1. Make sure your head is inside the wall
2. Use Vengeance Metamorphosis
3. Jump into the wall with Infernal Strike
4. Rotate your camera right
5. Jump out with Infernal Strike

The clip-back is dangerous, as you can clip into the 2nd boss' area instead of the 3rd.

Items used:

• Wearing: Onyx Amulet with Wind Sculpting Stone, 3x Azerite Armor with the Longstrider trait, speed enchants
• Before entering: Bear Tartare, Charged Phial of Alacrity
• During run: Gunshoes, Nitro Boosts, Quickwick Candlestick

Credit for discovering the clip at the start: (shown at about 2:30 in the video - although on the opposite side)

My Pandaria Remix PB: