The precipitation was following him. He was told not to twice.
No it began with the guy approaching Zimmerman while on the phone then the guy jolting. Zimmerman stopped following when he was told to do so...it’s on the tape.
I would have followed him if the guy started running. I would have attempted to keep him in sight as being a Watchman for the community...and I would have stopped if the police said to, and he did.