"We will see that he gets help and all his rights are protected. He is obviously an intelligent individual. He knows that eventually he will be taken into custody, so it would be best that he give himself up, before tragedy is written in blood."
This card may have been the Zodiac Killer's response. The Zodiac Killer was fond of tragedy, mailing a blood soaked piece of Paul Stine's shirt in the 'Bus Bomb' letter the following day, according to the October 12th 1969 San Francisco Chronicle article, entitled 'I've Killed Seven, the Zodiac Claims.' In the article it states "As proof the letters were from the true Zodiac and not an impostor, the maps murderer enclosed another portion of the piece of shirt he tore off the body of San Francisco taxicab driver Paul Stine, his victim last October 11th." A clear statement that the murder of Paul Stine was indeed the work of the Zodiac Killer and was "written in blood"'.
Well, maybe this was the Zodiac Killer's second response, contained within the same 'Dripping Pen' card, and delivered with a sense of irony: "I get aufully lonely when I am ignored, so lonely I could do my Thing."