This panel shows what? Sweat scaling? Shes shocked because hes taken Komugi hostage lol.
I already pointed out in another post that Pitou was scared of Gon himself, not just fearing for Komugi.
the underlying theme of Gon vs Pitou is the flip of Prey vs Predator dynamic. Pitou was predator until Gon arrived, and it’s visually shown when Pitou mentions that Gon could eventually bear his fangs at the King, hell Togashi makes it obvious when he literally draws an apex predator above Gon lmao.
The entire arc has an evolution dynamic to it, and Gon vs Pitou is the basically the battle Togashi uses to demonstrate it.
When Netero warns Meruem of the human malice he’s not talking about the bomb, he’s talking about people like Gon. Humans are a pest who will eventually become strong enough to kill an ant.
Edit: also why are you scaling the gon and Killua who ran away from pitou at the beginning of the arc? Gon and Killua are canonical power creepers, they get insanely stronger with training