the powerful and sometimes graphic images show the desperate race to reach the fourth floor, and that sprint down a long hallway where they encounter their now former colleague. >> he's in here. i thought it was my apartment. i thought it was my apartment. >> where'd you shoot him? >> top left. top left. >> reporter: several officers taking turns performing cpr on jean. and prosecutors highlighting this video to suggest guyger received preferential treatment. not isolated initially and here, seen hugging a fellow officer. even allowed to sit in a patrol car, looking at her phone while jean was rushed to the hospital. guyger claims after an almost 14-hour work day, she mistakenly went to the wrong floor of her apartment building. when she walked into what she thought was her home and saw someone inside, she assumed it was an intruder and opened fire. but today, prosecutors pressed one responding officer about the protocol when an officer believes that a burglary is in progress.