Me thinks this is the portion that they want in:
Without his conscious knowledge, the sight of the gun had sent a signal to his brain stem, passing a message to his amygdala....his blood vessels constricted so that he would bleed less if he got wounded. His heart rate shot up. A surge of hormones charged through his system, injecting power to his major muscle groups should he need to fight or fight.
As happens for most people in life-or-death situations, his brain began to manipulate his perception of time, slowing down the motion as he fled down the corridor. (not enough to make getting tackled, being chased, shooting someone, stabbing someone and slitting their throat happen in 62 seconds.)
Without being aware of it, Glennon had dropped his gun in the hallway when hed reached over to help the wounded officer. In moments of extreme stress, the brain does not allow for contemplation; it does not process new information the way it normally does. The more advanced parts of the brain that handle decisionmaking go off-line, unable to intervene until the immediate fear has diminished.
But this is the difference between the guy and the article and Jodi:
More than anything else, Glennon wanted to shoot back. He started to squeeze the trigger. Then from somewhere in the recesses of his brain, he reminded himself: You cant shoot. If he did, he would risk hitting the third officer standing behind the gunman. His training kicked in just in time, overriding his instincts. (her instincts apparently told her to mutilate).