Beckett, Castle and others in “Knockdown”

Beckett

Castle, there's something I need you to do

Castle

Name it.

Beckett

Go home.

Castle

Forget it. Fear does not exist in this dojo.

Beckett

Look, I signed up for this when I put that badge on, you didn't. It's not your fight.

Castle

[Suddenly incensed] The hell it isn't! [Calmer, but completely serious] I don't hang around you just to annoy you, I don't ride off to murder scenes in the middle of the night just to satisfy some morbid curiosity. If that was all this was I would've quit a long time ago.

Beckett]

Well, then, why do you keep coming back, Rick?

Castle

[Swallows] Look, I may not have a badge--unless you count the chocolate one Alexis gave me for my birthday--but I'll tell you this: like it or not, I'm your plucky sidekick.

Beckett

Plucky sidekick always gets killed.

Castle

Partner, then.

Beckett

Okay.