Although Lucy hadn't actively reinforced his body with mana or used magic, he was still a fifth level spirit beast. He shouldn't have to exert any effort to deal with something like a bubble made by a first level mage who had only awakened their inclination hours ago. Joshua didn't think much of it since he wasn't as aware of the discrepancy in strength between the two of them, nor did he know how hard Lucy had pushed against the bubble.
However, Lucy knew, and he felt like the bubbles Joshua would create in the future wouldn't be something an ordinary individual could destroy. Lucy didn't contemplate much more than that. Joshua had awakened a unique type inclination, so it wasn't weird for it to be strange and powerful during the right circumstances.
