Billy sensed the Predator from the beginning. Kept looking at the trees and noticing things are weird with lack of tracks etc.
Billy also stood his ground on that tree trunk bridge.
Dutch was not a person of specific interest until he started provoking the Predator, but Billy was way ahead of everyone else.
Shame that Predator just brushed it off like no big deal and killed him off-screen.
Jungle Hunter is a tough crowd.