SSVC.

Staircase Shield Vault Cancel: When running up a staircase and hitting a vault at the top, the server rejects the vault request (Local Vault) on the shield. The client continues holding vault until the server doesn't reject the vault. This causes a small desync on the server side that causes your client to vault over before the server side. Whenever the client lands on the ground, the server side is still midway through the vault, thus still on top of the shield. By vaulting the shield again on the client side, it causes the server side vault to be canceled. The server and client then both land on top of the shield. From there, you can either sprint to another surface relative to the shield's height, or double vault onto a surface next to the slope.