Martha (Liberty), Mavra, Mortimer.
Edited: Also, your personal circumstances modify how you react, perhaps that a moment where you are vulnerable to strong feeling. I had not the same reaction, mainly because I was pretty sure that was going to happen. Also because I thought she was going to die by a bullet accidentally shot by the gun when it felt to the ground. A random, nonsensical death. The only difference is that now Harry had a target, someone to revenge kill. But yes, as soon as the gun fell to the ground, I knew that was going to be how Murphy died. And when it was not an accident I knew somebody would take it and kill Murph. I suspect Listen or any veiled foe for a moment until Rudolph took it.