In the end, Lucia and the others decided to stick around with Ryan because even though they worked together by using Earth Punches, they couldn't slay demons as fast as Ryan. That being said, it wasn't like he was invincible. To show his true power, Ryan needed certain conditions like attack without moving or having a vantage point where he could see all the enemies and the terrain ahead. So, even though Ryan was harsh with his words, Lucia recognized that working with him would help her group and Ryan himself.
"You created those rings, right?" Lucia asked. "Can't you create more crossbows like yours for us? We will be able to help more with such weapons."
"You are really naïve… even if I could create crossbows like these, which I can't, it wouldn't help you guys all that much since your dexterity is low," Ryan explained.