The cries for help heard in the background of a 911 call from the night of Trayvon Martin’s shooting are not George Zimmerman’s, experts said Sunday. The experts said that the tests would be admissible in court, and that similar tests had recently been allowed into evidence in a murder trial. Screams and a single handgun report are heard in the recording. It's unclear whehter the screams are from Trayvon Martin. Meanwhile, a second ambulance, possibly for Zimmerman, was cancelled on the night of the shooting. As details from the shooting continue to come to light, a New York Times reconstruction of the night gives nuance to the events leading up to Martin and Zimmerman's fatal encounter.