Part of the problem with being a magical girl is that while you get some level of intuitive understanding of how your spells work, it's rarely perfect, and you have to find the rest out by experimentation. And some experiments would be disastrous if they happened to go wrong.
For someone with such a ridiculous name, the Veridian Garnet Guardian was strong. They hadn't really had the luxury of holding back at all. He was probably still alive, though. Probably.
Meanwhile they had to rest and recover before one of his fellow Guardians found them. Which meant having Emily splint her arm before healing it so they didn't have to find out if the Si Vales Valeo would straighten it out or heal it crooked.