About 12 seconds was all it took for two bailiffs to gun down a man who shot at them in a Florida courthouse lobby, and authorities said the swift response helped prevent anyone else from being seriously hurt.

Glen Lee Powell carried a .45-caliber semiautomatic handgun, 79 rounds of ammunition, an extra gun magazine, a lengthy fighting knife and a gas mask into the downtown St. Petersburg courthouse just after the lunch hour Wednesday. He fired at least two shots before Deputies B.J. Lyons and Marvin Glover fatally wounded him, Pinellas County sheriff’s Sgt. Jim Bordner said Thursday.