Coyle: Hey, Baxley! If your mom's vagina were a video game, it'd be rated E for everyone.
Traeger: Do you know what my job description is? I'm in acquisitions. I look up and I catch what falls out of the sky.
Casey Bracket: Do you have a plan? Ex-sniper with ptsd and a team that's mental? You're insane, right?
Coyle: Yeah.
Traeger: Predators don't just sit around making hats out of rib cages. They conquered space.
Quinn McKenna: Look, I get it. Something went down in Mexico. Nobody wants any witnesses.
VA Psych: I need to know if you pose a threat.
Quinn McKenna: I'm a sniper. Isn't posing a threat kind of the fucking point?
Casey Bracket: I think they're attempting hybridization. They're upgrading on every planet they visit.
Casey Bracket: What's on the ship?
Traeger: I think you know what's on the ship. The ultimate predator.
Answer: The Predator had landed in the middle of a group of hostile Earth soldiers, who it judged would likely have just shot it immediately. It would have defended itself. And there's also the fact that it could just be for fun because, hey, old habits die hard.