An "earwitness account" is no more hearsay than an eyewitness account. The accounts given by Zimmerman's family and friends and Martin's family and friends might be considered hearsay except as they portray after the event circumstances such as what they were told by Zimmerman or the police. What Dede's account points to is that Martin did not sneak up behind Zimmerman like a ninja and sucker punch him in the nose from behind as some here claim happened. First there was face to face confrontation with verbal exchange. Zimmerman was aware of Martin's presence and did not defuse the situation by identifying himself as a neighborhood watchman, or just walking away. He admitted in court that he did not know whether Martin was armed or not. It is a given that Zimmerman knew that he himself was armed when he got out of his vehicle and began the pursuit, in direct contradiction of neighborhood watch proceedures (both being armed and pursuing).
A part of the initial police report revealed that the entire incident was ultimately avoidable had Zimmerman behaved according to neighborhood watch operating proceedures. He violated those proceedures several ways and it led to tradgedy for himself and his victim and both families.