Goodwin said Holder went to an emergency room Tuesday to have her injuries checked out. He said her elbows are the most painful but noted there are also bruises and abrasions on her wrists, arms, back, neck and shoulders.
Holder said some of the abrasions occurred while she was "struggling on the floor."
According to the warrant, another man held Holder down while Hardy called 911. Tin identified the man as Sammy Curtis, who sat in the courtroom next to Hardy's agent, Drew Rosenhaus.
Neither had a comment leaving the courthouse. Goodwin left open the possibility that charges could be filed against Curtis, Hardy's good friend and business associate.
"I think additional information is coming out on him later today," Goodwin said.
Fialko said Holder attempted to contact Curtis multiple times on Tuesday evening while Hardy spent the night in jail. Goodwin confirmed that.
"She is very scared," he said. "The attempt at contact is what you would think [from] a very scared young lady. ... She didn't want to get hurt any further."
Asked if there was any prior evidence of physical violence between Hardy and Holder, Goodwin said, "I don't want to prejudice that information. The answer to that question will come out in court."
"She has never filed a complaint," Goodwin added. "She has never taken any action on that front, but that information will come out on that front."
Hardy's next court appearance is set for June 27.
Goodwin said Hardy and Holder met while Holder was working as a waitress at a downtown restaurant. He said the two have been in a relationship since September, that they lived together for a time but have not for the past couple of months.
While Hardy was in court, a group that included Charlotte Police Chief Rodney Monroe was at Bank of America Stadium for a previously scheduled meeting to discuss domestic violence.
The Panthers had no further comment on Hardy's situation Wednesday. On Tuesday, the team issued a statement that said: "We are very disappointed to learn of the allegations involving Greg and are concerned for all parties as we continue to investigate."
Hardy, also known by his alter ego "The Kraken," led the team in sacks this past season with 15. He was given the franchise tag during the offseason, guaranteeing him $13.1 million in 2014.
Carolina general manager Dave Gettleman has said repeatedly he hopes to sign the 2010 sixth-round pick to a long-term contract.