Party-goers' calls to 911 reveal how intense the rave was.

"It's a party, I feel bad for breaking it up," said one caller. "This guy needs help. He's OD'ing right now. He's about to die."

On social media, though, the crowd threatened authorities, so emergency personnel had to be careful.

"Nobody's
going to come in there, because there are too many people talking about
rioting. I need you to bring him out to the road and get him help," a
911 dispatcher said in response to the call described above.

The
sheriff's department is also investigating a reported sexual assault at
the event, but Mecosta County Sheriff Todd Purcell says the victim's
level of intoxication at the time of the reported crime has made it
difficult.

Purcell says the department's main goal now is to
prevent a similar gathering from happening again, by monitoring social
media and threatening to seize the organizers' vehicles if they continue
to plan another rave.

MORE: Social media encouraged #ProjectP rave, also helped police response

Investigators
say this was the second event of this type Johnson, Misner and Taylor
have organized. Purcell says he stands by his decision not to break up
the rave, based on anti-police comments the crowd was chanting, as well
as talk of rioting if officers intervened.  He also says breaking up the
event would have put the participants at greater risk, as many of them
were visiting the area and could get lost or potentially hit by
vehicles.