Chase, I've watch a little much of NCIS reruns and believe me I laugh a little or maybe a lot when Gibbs does his head slap DiNozzo the most but not that painful just either a wake up call or being childish while on the case. (I don't own the TV show whatsoever)I don't know who you're referencing, but I never shoot the messenger (or surrogate questioner for that matter).
I've interrogated messengers, but they're usually considered non-combatants.
Just to be clear, I don't slap people. You're safe.