Both boys breeze through their initial matches on the lower floors using the raw strength they gained during their training at the Zoldyck estate.
During a match between Killua and Zushi, Killua is unnerved by a strange, overwhelming pressure Zushi emits. This is the first formal introduction to the concept of Nen (and its sub-principle, Ren ) in the series. Hunter x Hunter 2011 (Dub) Episode 27
They meet a young martial artist named Zushi and his mysterious teacher, Wing . Both boys breeze through their initial matches on