The lawsuit alleges that at about 9:50 p.m., when the party was winding down, a White female neighbor “entered the Duroseau home uninvited with a large German Shepard and demanded that the music playing in the backyard be turned down.”

Duroseau allegedly told the woman that the party “would be winding down soon” and asked her to “leave his house and his property.” Shortly after that, Rosebrock allegedly “took his water hose and began water hosing" partygoers in Duroseau’s backyard “to get them to disperse, creating a scene reminiscent of 1960’s Birmingham, Alabama, when White law enforcement officers used fire hoses to douse, assault and batter African Americans participating in civil rights demonstrations in an attempt to get them to comply and disperse.”

According to the lawsuit, Duroseau and some other guests climbed Duroseau's sons treehouse in the backyard near the fence to ask Rosebrock to stop spraying them but “Rosebrock doubled down and continued water hosing.” “We experienced a very specific, very heinous type of attack that harkens back to a dark period of this country’s history,” partygoer Katya Dossous said in a statement obtained by PEOPLE. “A monstrous, racist, hateful tactic historically used against people of color. An attack I believe was premeditated, deliberate and thought out with the intent to make us feel less than, like animals. “Water hoses have long been used against people of color. Mr. Rosebrock chose this specific method with the intent of dehumanizing us,” she added. “It was deeply disheartening and demoralizing to be subjected to a hateful crime at Doctor Duroseau’s home, during a joyful birthday celebration for my friend of 30 years.”