"Give my uncle time. He'll have you swinging lightsabers like you've been doing it your whole life in no time," and that was a promise Ben was sure Luke could deliver on. Finn's natural Force ability would kick in as soon as he gained the confidence for it.
As much as he wanted to break out of the bubble and get up close to the dinosaurs, Ben felt like they shouldn't. If something happened and they somehow ended up causing trouble for others, he would feel guilty. Besides, it wasn't too bad inside. And they did have free reign over the valley. "Maybe next time. When your training has improved, padawan," he teased.
"The easiest part is to float." Ben had learned to swim from a young age so it always surprised him to hear others confess that they didn't know how. Given Finn's past, though, it was understandable. "You'll pick it up in no time."