Hide by the door and sneak out

You press yourself right next to the door. On the side that the door will hide you when it's open.

The knocking becomes a bit more urgent. It opens suddenly and an adult woman wearing a fancy ball gown enters. She is shocked when she sees Lord Silvermoon tied up, but a smirk crosses her lips.

"Your little fun turn against you, husband," she says sitting on the bed. "I guess I can takeover for now. Where did I put that strap on..."

You dart out the open door. After you catch your breath you begin searching for the vault. The sound of Lord Silvermoon's gagged screaming echoes down the corridor.