The first chalking arrest happened around 7:15pm and the second arrest happened around 7:45pm at Downtown LA Art Walk on July 12, 2012. Below is photo and video evidence of what occurred between these two arrests.
Live Stream recorded in between first and second arrest This video is choppy and blurry but you can hear the activities that happened around 7:30pm. The video shows more officers jay walking and Captain Horace Frank telling peaceful people that he will declare an unlawful assembly and will arrest everyone.
UStream footage capture live, shows some of what happened in between the first arrest at 7:15 and the second arrest at 7:45pm. The video is choppy and blurry but gives a sense of the interchanges with LAPD and participants of Chalk Walk.