Rincewind ducked and staggered back when the door opened from the top...but there was another door! Clever. He could almost see how it would work, even without spells, but it was still a bit beyond him.
He was about the answer the damsel not-in-distress when an authoritative voice started arguing with her. He found himself experiencing the desire to save her, help her out - a feeling he rarely found in himself because he was usually running away from the pointy-ended weapon right after he got even a glimmer of feeling it.
Clearing his throat, he called out, "Good sir! I was just checking to see if the lady was in trouble or otherwise in need of a wizard. If that is not the case, then I will just be off. Please don't take it out on her. She even told me she wasn't going to open the door!"