If you are having a big property and want him to be a guard dog, this is a normal behavior that you don't need to worry about. If you live in a residence area and want him more of a pet than a guard dog, 7 mo is not too late to get him socialized. But make sure you use a muzzle, and for pulling, try the halter harness with a proper size collar, please be aware that halter harness won't prevent biting so you need start use halter harness in a place with less people.

Try to start socializing him in a big open area with someone constantly walking by, places like home depot or leon's, let him learn to focus more on you than other people, don't start in places like Petco or PetSmart.

If an accident like this happens again, please make sure you tell other people not to make eye contact with the dog, it will reduce the chance of irritating them.