Teen Wolf, Season 5

[Stiles and Theo are debating what to do after Theo killed Josh to save Stiles when sirens are heard]

Theo:
That's not an ambulance, is it?

[Stiles shakes his head in the negatory]

Theo:
We should get out of here.

Stiles:
[points to Josh's body] We can't just leave him.

Theo:
Fine. All right, let's take him. Someone's stealing the bodies anyway, right? Here's our chance to find out who.

[Stiles, overwhelmed, hesitates for a moment]

Theo':
Stiles, come on. We gotta do something.

Stiles:
You killed him.

Theo:
In self-defense. He was going to kill you, and me! If we stay, we're either going to have to tell the truth, or we're going to need a pretty convincing story. It's your choice. I'm not going to ask you to lie to your dad.

Stiles:
[sighs] Don't worry... I've had plenty of practice.