If the girlfriend who was on the phone with Martin is to be believed, it contradicts the statement of Zimmerman's father that Martin jumped out at him. What will be really important is the phone log of Martin's phone and the time that the call to Martin cut off. That will be crucial to fill in the gap between the end of Zimmerman's 911 call (7:14 PM) and the first neighbor 911 call reporting two men struggling (7:16:11 PM). If, for instance, he was still on the phone to the girlfriend just before the struggle, the "he jumped at me" defense will go out the window.
I won't believe a word she says without corroborating evidence. I've seen too many black “witnesses” lie to protect a black perp simply because he was black.