Maru looked over his shoulder at the door, and then back again. Was she expecting someone to come in and peek? Were there strange people like that on the train? That was weird...

"Alright..." He'd guard the door if that's what she wanted. No one would get in and see her. "You put yours on first." He turned and walked to the door, then stepped out and leaned against it, arms folded. Maru wouldn't let anyone enter unless Madoka said they could.