Emergency nurse practitioner Jo Birkenshaw assesses 78-year-old Paul who has come to casualty after being bitten on the nose by a dog and may need reconstructive surgery. Meanwhile, registrar doctor Rob Cornford treats 73-year-old John, who is struggling to breathe, and consultant doctor Bharath Reddy and junior doctor Jake Mullen treat 52-year-old Steve, who is losing a lot of blood from his arm