I'm not sure if I can do so without landing in those thorn bushes. I had to walk through them to climb up the tree, and even that was a bit painful...

[And there was another reason, which Luke may very well be able to guess. Ion can smile when he's looking at Luke, but when his eyes look to the ground directly below him, he grips the branches of the trees just a bit tighter. Luke should know what happened last time Ion fell out of a tree... the situation may be different, but that doesn't stop him from feeling a little uneasy.]