SANFORD, Fla. - A neighbor of George Zimmerman testified Friday that it appeared that teenager Trayvon Martin was striking Zimmerman while straddling him moments before the teen was shot.

Jonathan Good, who lives in the same townhouse complex as Zimmerman, said after hearing a noise behind his townhome, he saw what looked like a fight. When he stepped outside, he said he yelled, "What's going on? Stop it."

"It looked like there were strikes being thrown, punches being thrown," said Good.

Zimmerman, 29, is on trial for second-degree murder for the February 2012 shooting death of Trayvon, 17. Zimmerman, who has pleaded not guilty, has said that he acted in self-defense after he was attacked.

When he looked outside, Good said he could only see one person at first. Seconds later, he saw two people laying flat, one on top of the another in the grass. A person in dark clothing was on top of a person with "lighter complexion" wearing red or white clothing, Good said. The description of the person on the bottom, Good said, matched Zimmerman that night. The person on the top had similar dark clothing to the type worn by Trayvon, he said.

Under cross-examination by defense attorney Mark O'Mara, Good testified that during the tussle, the teen appeared to execute a mixed-martial arts maneuver known as"ground and pound."

Good testified that he heard one or two calls for "help" and thought the words came from Zimmerman. Good said he did not see actual blows between the two, however.

Good said was dialing 911 when he heard a gunshot.

Before Good testified, a worker at a video surveillance company that maintains cameras at the townhome community took the witness stand. A prosecutor played two videos from surveillance cameras; one showed what looks like a person walking past a window at the complex's clubhouse, and another showed what looks like someone with a flashlight by the complex's mailboxes.

Jurors already have been shown some of the state's biggest pieces of evidence, including the 911 call featuring cries for help prosecutors believe came from Martin.

On Thursday, Rachel Jeantel, who was on the phone with Trayvon moments before he

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