neville gonna give you up

[Ellie puffs out her cheeks while she tries not to laugh at him. No, no, stop Ellie, that's mean.]

It's... it's an expression. Here, look.

[With a jerk of her wrists, she ejects the clip, showing him the bullets loaded up into it, pulls one out to hold between her fingers.]

This is called a bullet. You load the clip of them into here, like this-

[She loads up the gun, keeping the safety on, and points out the trigger without touching it.]

Then you aim it, and pull here. The gun fires the bullet into whatever you're pointing at.

[Ellie's expression sobers.]

It's a muggle thing. And they're very dangerous, so if you find one, don't mess around with it.