The trouble started early at the Phoenix Comicon last month. On May 25, the first day of the Memorial Day weekend event, police arrested 29-year-old Mathew Sterling, dressed in black and armed with two .45-caliber handguns, a .454-caliber handgun and a 12-gauge shotgun, all fully loaded; a combat knife; pepper spray; and throwing stars. He had planned to kill “bad police,” according to The Arizona Republic. In addition to outlawing costume-props for the rest of the pop-culture gathering at the Phoenix Convention Center, organizers also had to grapple with the ripple effect of increased security. Lines were rerouted.