When Claire's nose bleeds all of a sudden, Jack comes over to help and tells Charlie to, "Put her head back, put her head back." A real doctor would have advised to have Charlie tilt Claire's head FORWARD. The common practice of tilting backwards will cause blood to run into your throat. At the very least, this could cause you to cough and if you swallow a lot of blood, you might throw up. At the very worse, you could choke to death.