Ben falls from his bike and his leg breaks. He knows it is broken because he can see part of the bone sticking out of his skin. Ben has a compound fracture.

I'm sorry to hear about Ben's accident. It sounds like he has indeed sustained a compound fracture, which is a type of fracture where the broken bone pierces through the skin. This can be a serious injury and requires immediate medical attention.

In this situation, Ben should focus on keeping calm and ensuring his safety. Here are some steps he should take:

1. Call for Emergency Medical Services: Ben or someone else at the scene should call an ambulance or emergency services to quickly get him the medical help he needs.

2. Immobilize the Broken Leg: It's crucial to prevent any further damage or movement to the broken leg. If Ben is able to do so, he should try to keep the leg as still as possible, preferably in its current position. Avoid trying to realign the bone or pushing it back into the skin.

3. Control Bleeding: If there is any bleeding, it is important to apply gentle, direct pressure using a clean cloth or bandage, while avoiding further aggravating the injury.

4. Stay Hydrated: While waiting for medical help to arrive, Ben should try to drink some water if possible. This can help prevent dehydration, which can occur due to the shock and stress of the injury.

It's important to note that these are general guidelines. The specific actions taken may vary based on individual circumstances and the availability of medical support. Professional medical assistance is crucial in cases of compound fractures to ensure proper treatment and minimize complications.