More likely than not, your friend has collision insurance on the vehicle and he probably needs to get the vehicle fixed/replaced as soon as possible. He/She should contact their own insurance carrier to make a claim for the damage. The carrier will then most likely subrogate against the offending vehicle's insurance company for the amount it paid out to your friend based upon percentage of liability.
As I am licensed in Florida and Vermont, I cannot provide you with specific information as to New York State law. However, based in your description, the adverse driver is liable to pay your friend for the damage to his vehicle. If the adverse driver is insured, that drivers insurance company will pay. If the adverse driver is not insured, your friend may be able to collect under his collision damage coverage or his uninsured motorist coverage, if he has those particular coverages on his policy.
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