Lien's family released a statement Thursday through its attorneys, saying he was "forced under the circumstances to take the actions that he did in order to protect the lives of our entire family."
He and his wife were out to celebrate their wedding anniversary with their daughter when the incident happened, according to the statement.
"We know in our hearts that we could not have done anything differently, and we believe that anyone faced with this sort of grave danger would have taken the same course of action in order to protect their family," the statement said.
Lien initially called 911 on Sunday afternoon to report that bikers were driving erratically on the West Side Highway. As the confrontation unfolded, additional calls were logged by 911 operators, including one from Lien's wife that was placed during the attack, police said.
Jerome Davis said he witnessed a part of the confrontation and described the SUV driver as a "maniac."
"If something happens, you stop right there. It's an accident. You think and stop. You don't keep reacting on," he told CNN's Erin Burnett on Wednesday.
But on CNN's "New Day" Thursday, Davis said, "Two wrongs don't make a right" and said it was clear the SUV driver was afraid.
"If I was in his shoes, I'd be scared," he said.
No charges against driver
Police have not said that they are seeking any charges against Lien.
But they arrested Christopher Cruz, who is seen slowing in front of the Range Rover before he was bumped.
Cruz, 28, was in court Wednesday on misdemeanor charges including reckless driving. Cruz's attorney told reporters that his client is not guilty.
Cruz was to be released after posting $1,500 cash bail and a $15,000 insurance bond. In addition, his license was suspended, and he was ordered to surrender his passport.
"His motorcycle was struck, and he stood right there," Cruz's attorney H. Benjamin Perez said. "He never assaulted this man. He never tried to assault him in any way. And he does not know any of the other motorcyclists who were involved in this beating."
A second arrested biker was released Wednesday when authorities determined that he may have been trying to help.
Allen Edwards, 42, originally faced charges of reckless endangerment, criminal mischief and menacing, police said.
But that didn't mean prosecutors were done.
"Prematurely charging individuals with low-level crimes does not further the goals of the investigation and could weaken the cases we expect to bring against the perpetrators of serious crimes," said Karen Friedman-Agnifilo, the prosecutor who is overseeing the case.
"After we investigate the facts and each person's individual actions, we will know what charges can be supported by the evidence. There is still a tremendous amount of investigation to be done."
The New York Police Department released images and asked for the public's help in identifying and locating suspects.