When Joker grabs him and pulls him into the air, Susan is surprised at first, but after a moment he flaps his own wings before trying to squirm away.

"I can fly too! I just, can't carry anyone." Which sucks, but whatever. It's what happens when you're small he guesses.

He keeps an eye on Lauren from the air, so he can be careful not to hit him with his fire, and once he's sure his brother is out of the way he throws more fire at the vines, a stronger attack this time, and for the first time in his life he can't help but wish his magic would go out of control and bring even more fire exploding down on them.