[caution, NSFW, language]...
From the Herald:
Around the same time, an event security guard stopped Lt. Douglas Simon and pointed out a woman who had just been thrown out of the concert due to “unruly behavior.”
According to police reports, Simon tried to stop the woman but she ran.
Simon, atop an ATV, caught up with her and stopped her. But as he detained the woman, crowds began to surround Simon, who requested backup. [...]
As Simon arrested Sara Greenback, a 25-year-old from Maryland, police say Abelardo Antonio Soto began throwing sand at Simon, and inciting the crowd.
An arrest report says Soto, of North Miami, “was able to turn the crowd hostile towards officers, as numerous people began fighting with officers.”
The report says that Simon approached Soto, who struck the officer with a weapon. Simon suffered a deep cut on his forehead and received stitches at Mount Sinai Medical Center, according to reports.
Soto, 29, was arrested and charged with aggravated battery of a law enforcement officer, resisting an officer with violence, and affray.
Greenback was charged with disorderly conduct and resisting arrest without violence.
UPDATE: Riptide has the whole series of videos.