He behaved very badly at the scene, but if you have ever been in an accident, the shock and adrenaline can make people behave oddly. Once he had calmed down, he behaved in an exemplary manner, so I feel that the initial aggressive response was out of character.
Glad you had a good result from such a horrible encounter.
(It saddens me that "not lying to your insurers" is exemplary, but it is. He may have even told his insurers his behaviour, which would make them very keen to settle.)