Just because he is a fellow Mustang driver does not constitute a immunity!!!!
You by all means did the right thing!!
If he is drunk and in fault of the accident then great he was caught. If he wasn't at fault of the accident then there is still the possiablity of the driver being drunk, then you still did the right thing by bring attention to him before he hurts himself or another. At least he will get that tow that he wants.
Good Job
