He's immediately on the defensive, face twisting a little - as if he's about ready to snap back at her but he swallows it down. Luckily, being polite is so ingrained in him that all he can do is go with it.

"I am not going to get myself into trouble," he replies, voice tight. But politeness does come first, doesn't it? He gives her another proper bow, bending with his hands in front of him. "What is a train?"