He immediately frowned when she looked sad. Her eyes got so big! How was that possible? "No, no, no. No. No." Hiccup was totally fine. He just didn't know how to say that. So he smiled widely. "Not hurt!" Sure, it sucked and it was kind of unwieldy and it hurt his leg if he was on it too much, but that was just what he needed to do in order to be mobile.
"Hi Nina!" He grinned again, this time more natural and less about making her eyes go back to the way they were supposed to be. "Happy?" Hiccup didn't want to make her sad, that was for sure.