He sure does. The mall ninja did with his mall ninja act.
"a witness says Trayvon attacked Zimmerman:"
There's no witness at all to anything other than a fight in progress. There's no witness at all to Zimmerman attempting to end his mall ninja act. Nevertheless, it was the mall ninja wanna-be that stated the whole confrontation.
The transcripts of the phone calls make it improbable that Zimmerman initiated the violence.
Zimmerman tells the dispatcher that Martin is running and exits his truck to follow.
Martin tells his girlfriend that he`s lost Zimmerman (which is corroborated by Zimmerman telling the dispatcher he`s lost sight of Martin).
Zimmerman never caught Martin. How is he supposed to have initiated violence