"Oh?" Gen asked, and went to kneel on the door across from Xue, to examine the swords and the talismans. His attention was chiefly on the dangerous individual in front of him, however.

That's the hidden concern he had, the reason he was pursuing a friendly relationship with this man. He's a murderer, he was capable of dangerous magic, and Gen was a paranoid sort. Was Xue still dangerous to others? To Senku? Of course, Senku's interest in helping Xue and his budding friendship was no surprise to him. Senku had a track record of that kind of thing.

Cheerfully, Gen laughed, "That does sound like Senku! Even though magic like this is very new to us, it's not going to stop him from trying to solve a problem. And given his genius, I'm sure he helped you a great deal. You wouldn't find someone smarter on this train."