Link to article: http://www.huffingtonpost.com/bennett-l-gershman/trayvon-martin-witnesses_b_1549128.html
I'll bet that this witness would like to take back her new story since it was probably given before she had a chance to see the pictures of the damage Trayvon did to Zimmerman's head, front and back. The pictures and autopsy of bruises to Trayvon's knuckles prove this witness's new story to have been conveniently altered to fit the prosecutor's agenda, aka witness tampering.
Witness 4 Original story: Witness states that on the night of the shooting that Martin was on top, "just throwing down blows on the guy, MMA-style." Witness also recalled that Zimmerman was calling for help. New story: Witness tells prosecution he isn't sure who was calling for help.
I'm sure this witness was worked over to try to say that Zimmerman was on top, but the most that the investigators could get him to say is that he couldn't see whose mouth was moving when he heard the cries for help that odds are didn't come from the guy on top "throwing down blows MMA style".
This prosecution team should face their own prosecution for witness tampering.