Sam doubted that Luke had started self-teaching himself because he thought it would be cool. From what he understood about a lot of people on the island, a good number of them took up various martial arts in order to protect themselves as others.

"So how did you get the sword back in your world?" Sam asked. The weapon looked real, like the sort of thing you'd actually use in a battle. He doubted that those types of weapons were easy to come by.