"I do not have time for this," you mutter, turning and throwing a wadded-up paper towel into the bin beneath the dispenser.

"Make time, magic man," William advises. "'Coz you ain't leavin' without goin' through us."

"That's what you think," you reply, waving. "Later."

With that, you release the spell that you've been weaving since you saw these two lunkheads come in, and vanish with a burst of strange, humming light.

Their expressions are memorable.

"Wot da zog?!" Marsh bursts out. He rushes forward, and you quickly fall back, footsteps muffled by the secondary effects of your invisibility spell. Between that and your latent memories of a thief's silent strides, William doesn't notice you; he's too busy waving his hands frantically through the space where you were, and then around that. "'e can't do that!"

Othrym says something in a language you don't recognize, but which sounds like rocks grinding against each other. William snarls back at him using the same tongue, and the giant-spawn withdraws from the bathroom with some haste. This happens to leave the door clear, although William is mostly-blocking the way forward, long arms spread out as far as possible and head turning slowly as he scans the stalls and the tiled floor. His expression is slightly suspicious, but also deeply worried - if you had to guess, you'd say that he really thinks you teleported out, and is grasping at the faint (if correct) hope that it was a trick. Othrym has probably been sent to check and see if you're in the ring, or perhaps to fetch some source of assistance.