If they were facing each other, Lambert would give Gon the most scathing look possible. Who does he think he's even talking to?

"Monster hunters don't usually go for non-harmful!" he snaps. They undoubtedly make a stupid sight to anyone without the ability to see past the glamour -- one grown man clinging to the back of ... well, actually, it's a bit hard for anyone to tell that Gon's to be a teenager, no matter what form he's in. It's still a pretty stupid sight even with the glamour, so they're both shit out of luck there.