Ducky and Palmer in “Lockdown”

Ducky

Well, I can confirm that the captain did indeed die from a crushed trachea. The killer used what is known in Shaolin kung fu as a "claw grip."

Palmer

It takes some serious strength for a layman to crush another person's trachea using only three fingers.

Ducky

So either you're looking for someone extremely strong...

Palmer

Or someone trained in dragon style! (strikes a one-legged kung fu pose) Waaaaa...! (laughs, then sees Gibbs and Ducky's unamused looks) I won't do that again.