SNIP On Friday, the Daily News obtained EMS documents suggesting Zimmerman, who an ex-colleague said was fired from a security job for being too aggressive, did not sustain serious injuries in the fatal encounter. Paperwork detailing the EMS response to the shooting scene shows that a call for a second ambulance was canceled. An audiotape containing the EMS communications, also obtained by The News on Friday, records unidentified workers discussing the scene. Zimmerman’s condition is mentioned briefly in the 30-minute recording. “Do we have a second patient?” a man asks. “That’s affirmative. We have a second patient,” a woman replies....