Luffy lets him tumble a bit, then catches him, wrapping him up in stretchy arms to break his fall. He let's his body snap back, bringing him closer, but let's go before he rockets into Danny. He grins at him, not the least bit bothered by the fact that his friend is in a heap.

Looks like you're going to need a lot of practice! Shi shi shi shi!

Don't worry, don't worry! It took me a while to get a hang of my powers when I first got them, too!

The rest of their training is fairly straight forward, and fun, with Luffy mostly being good natured and laughing throughout. Not at Danny but just clearly having fun in general.

At the end of it, he flops on the beach, relaxing in the sand. And, finally, he opens up a bit to his new friend.

This is fun. I like it hear. But, I really need to get back to my own world. Soon.