In Men In Black, shortly after the Bug crashes, Edgar approaches him and they have a brief conversation:
Bug: Place your weapon on the ground.
Edgar: You can have my gun, when you pry it from my cold dead fingers.
Bug: Your proposal is acceptable.
He then proceeds to consume Edgar and steal his skin.
Why did the Bug give Edgar a chance to surrender?
Edgar was obviously no threat to the Bug, as demonstrated immediately thereafter when Edgar resists. And I'm pretty sure he wasn't going to let Edgar live either way.
Obviously it created good tension for the story, though I'm curious if there's an in-universe explanation as well.