Castle, as a friend, I am asking you not to leave this car. 

And here’s Castle, sitting in the car pretending he’s in a car chase. And he’s actually humming action-hero theme music.

CASTLE…Pum-num-nah-nah-nah-num-nah-nah. Pum-num-nah-nah nah-nAAH. De-nah-num-nah -NAAAH.

[He grins. Having too much fun for a guy his age when…WHAM! A body hits the car hood.

Bad guy (grunts) Oh, God!

[Castle is face-to-face with Karl Nadir, the man from the police sketch, which by the way, happens to be on the dash. He looks at Nadir, and then at sketch. Yep. That’s the guy. And Castle does the only thing he can think of with a guy staring at him through the windshield. He turns on the wipers. The wipers smack Nadir’s beady-eyed face. Nadir rolls off the hood and levels his gun at Castle from the driver’s side.]

[Castle’s a little taken aback, as he stares down the barrel of Nadir’s piece.]

CASTLE: I… She told me, actually, I have to stay in the…

Bad guy: Out of the car now!

CASTLE: Okay! Okay, okay! Here I come. I’m coming.

[Castle starts to open the door and then, BOOM, he shoulders it. The door slams Nadir, knocking him back. Castle gets out of the car and slams Nadir. They roll, with Nadir ending on top. He punches Castle right in the face. Nadir grabs the gun, but Beckett steps on his wrist.]

BECKETT: Go ahead. I need the practice.

[bad guy drops the gun.]

 Bad guy: Ow. Ow. Ah.

CASTLE: I tried to stay in the car. I really did.