Mack | Kara.
Look, I've made my share of mistakes because of the job, mistakes that ended up hurting people I cared about, fragmenting their trust in me, and there were a few occasions where apologies were the only thing I had to try and put that back together.
But no one is obligated to apologize. Especially not to someone demanding it at gun point.
I've killed. I've been prepared to kill. But there's a difference between combat and shooting someone who trusts you point blank.