Paediatric Polytrauma

5 years old boy Anthon and his mum went for a city walk. At the very moment when mum wasn´t paying attention, Anthon got on a road. The next things mum heard were squeaking brakes and bump. Our little boy is now laying on the road. You are a bystander in this accident and you want to help. After making sure the road is safe, you get to the boy. You are trying to address him but he doesn’t react back, he seems to be unconscious. He has an open fracture of the left thigh bone with massive bleeding. His mum is absently staring at the scene, so you are asking for her help. Also, you are asking the driver for bringing reflecting vests for everybody and securing the car with the warning triangle. What are you going to do next?