"A Landfill Hotel?"

When Ainsley and Cellino heard the Godfather's words, they started to look at the previous stranger teenager in a new light. 

So, that's how it works! 

Air pressure was actually a non-common ability, but people usually used it only for suppressing someone because it took a long time or a lot of energy to injure someone. 

However, the teenager before used the strength from his feet to amplify the air pressure effect. He focused his energy on his foot, affecting the air pressure underneath his shoes, instantly crushing the monster's head. 

This could work because the monster was still a low-level baby monster, and the skin around their head area wasn't that thick yet. 

Still, to know the weakness of that baby monster and used his power accordingly, making it seem as if he just casually stepped on the monster, was one hell of a performance.