What's the best way to handle this situation?

Poke the aggressor dog eye out and then bitch slap the owner of the pitbull who obviously has zero clue how to control a dog

Pitbull can be really sweet and passive but there’s definitely something wrong with the breed

here’s what you do. it works too

Put your thumb in the butt of the dog that's locked on. It works every time.

See that leash? Take that, throw it around the aggressors neck, pull up to cut off oxygen, dog will either let go or pass out. Then you go get proper training for your reactive dog, which you should have done long before this incident took place.

My answer - Hey Blackie, LET'S ROCK!! 😁👇👇👇😁

Cut off his breathing until he releases.