Interesting video. Probably not what constitutes assault in my mind but I would have thought that most Law Enforcement Officers would've have taken the behaviour of the scn'ists as threatening and intimidatory at the very least.
Badge #3915 obviously bought a "bill of goods" from the SO videographer.
Actually, it's more than assault; it's battery too, since the Scientologist actually touched him. It was already potentially assault as the guy made the threatening 'pistol' motions and approached him.
But, I'm not surprised that the cop didn't want to hear about it. Cops on the beat are more interested in 'keeping the peace' than the letter of the law in a lot of cases and Sparrow was pretty obviously unhurt.
Had Sparrow insisted on filing a police report, he probably could have, and, most likely the prosecutors office would dismiss the charges, leaving it up to Sparrow to file a civil case.