No point making rules against things that are impossible.

“Very quietly, James slipped out of bed and shrugged into his bathrobe. The ston…”

“James Potter moved slowly along the narrow aisles of the train, peering as nonc…”

“Snape replied pointedly, “I learned when not to talk from the master, Albus.”

“James Potter moved slowly along the narrow aisles of the train, peering as nonc…”