Sorry, but maybe it's the L in me, but I disagree. I WOULD respond, but only to say (a) I did not threaten your life or threaten you in any way and have no idea what you are talking about and (b) I will be taking action to protect myself. Very business like and to the point. Nothing more.
GIMA, I respectfully disagree. There are 1000 reasons SD can give, unless she has PROOF that he received, read and understood the message.