She watched as he inspected the lighter, wondering if there was something specific he was looking for. It would work, she had no doubt about that. But he seemed to be so focused on the lighter than Hermione thought he must be trying to unravel how it all happens. Considering there was no specific way to explain how magic occurs, she was sure he would find nothing.
"First of all, it is a wand not a stick. But using magic without a wand is possible, but not so much when it comes to transformation. Certainly in battle, but it takes a lot of concentration until you are perfect in your understanding of how the spell works."