Beau nods slowly along with the explanation, with occasional glances around in case the guy shows up in his large, furry, stolen body... then slowly turns back to stare at Gon.

"'Spirit.' Uh. Is he like... a ghost." She's more used to all things ghostly and spirity being translucent or balls of light or the like. Zangetsu's weirdly pale, with dark eyes that are kind of creepy in retrospect, but nothing that shouts spirit possessing a fake body. However that works. "Are you saying he's a ghost... and he can steal peoples' bodies. Is that what you're saying."