It was the neighbor who actually called the police, but you can hear Evelyn in the background saying “He Headbutted me”.
The neighbor describes the incident as a “Little Domestic Dispute” and asks the police to not make a scene and keep it is a quiet as possible.
The neighbor goes from showing concern about Evelyn to trying to downplay the incident. What we do know someone headbutted someone.
If you listen closely the neighbor is under the assumption that Evelyn hit Chad and she responds that he headbutted her, but doesn’t speak on his first question about her hitting him.
Since, neither of them are talking we may never know the truth, but whoever was at fault should come forward to clear the other person’s name.