S1, E3: A gunman shoots Stella, who is saved by her bulletproof vest. Lawson realises the man is trying to commit suicide-by-cop. Putting his own life on the line in a face-to-face negotiation Lawson recognizes the gunman as his former mentor. While Stella confronts her brush with death, Lawson is forced to act against his beliefs and shoots, killing someone he knew well.