the 53-second video , posted on youtube , features footage of the unnamed woman recording an incident involving multiple officers in south gate on sunday .
about 25 seconds into the clip , the woman who had been attempting to speak to some of the officers is approached by a tall man strapped with a riffle who suddenly lunges at her that following a brief struggle the man - later identified as a deputy u.s. marshal - grabs her cell phone , throws it to the ground .