Experimenting with murder

Upon opening his apartment door, two strangers suddenly appeared behind him. Working quickly and in tandem, they completed their task – jabbing the apartment dweller with a syringe and injecting its contents – and then fled. The victim sought both help and accountability, calling a first-aid centre and chasing after his attackers. He did not get far in his chase, seemingly losing the ability to move after a short distance due to illness. He relayed the circumstances of the assault to the first-aid centre responder on the phone, gasped for a few seconds, and then provided his address. After this, he was non-responsive. Doctors arrived in ten minutes to discover the victim was dead.