According to "Josie" in the radio call-in account, officer Wilson (1) from his car told the two thugs to get off the road and walk on the sidewalk to not obstruct traffic, and got a response of defiance and profanity. But he still rolled on by and let it go. Then (2) he got a police radio-call of the strong-arm robbery and put 2 + 2 together, and (3) called for backup before reversing to further scrutinize the two thugs. At which point (4) he was assaulted.
Again, sketchy details at this point, the investigation will reveal the exact details. If he called for backup, the backup request will no doubt have been recorded.
