Eleven glanced at her wrist, nodding.

"It's enchanted with a strong barrier spell," he answered, glancing back to assure both of them were close before carefully taking a turn. "..Last I knew, anyway."

Biting his lip, he threw the ball of light down the corridor, watched it flash by walls, then vanish. Darkness prevailed for a moment, but another spoken word in Osmarius and the rune on his palm flared to life again.

He stepped carefully. "Mr. Fell, could you use your chalk on the floor? If the walls can't be relied on.."