Bron is worried about Ben. He has slumped into a depression since Steph's death and she is concerned he is not taking adequate care of himself. So concerned, in fact she has temporarily moved into his flat to keep an eye on him. Which is where Ben drops his bombshell; he has decided to transfer from active paramedic duties to a desk job at HQ. Bron is aghast. She knows this is an ill-considered decision borne of his depression, but Ben won't hear reason. He is quitting just as soon as he finishes the paperwork.