Yorkshire terriers have a nasty bite, they were bred to kill rats in factories. One of my relatives had one and it destroyed a series of rubber dog chews. She eventually got it one designed for a rottweiler and it nearly destroyed that. The 'devil dog' could easily have come off worse.
Not all Yorkshire terriers! My gran went to buy one from a breeder but saw a female 4 year old being bothered by an 18 month old male. It looked terrified but was acting as a mother for the puppies from another dog who abandoned them, a really nice dog but obviously mistreated because it wasn't productive. My gran walked out with it having made the breeder accept a low price. The dog had been fed very cheap puppy food as they didn't really want it knowing it couldn't breed. My gran took it to the vets and it had rotten teeth. Once taken out the remaining teeth, 2 top either side and two bottom either side, really couldn't harm any human.
We used to get it to bite bite our curled index finger and rag our hand. Then it would stop and we would rag it. The dog loved that play, even if it ended up with the dog flying around by it's four remaining good teeth.
It later got another 2 teeth taken out and died a lot younger than my grandparents first Yorkie, probably because of its chest 4 years being so poor.
Anyway, a Yorkie is a small dog but you shouldn't treat it as one because they're tougher than their size and fluffy, lapdog looks. A diminutive, real dog! I expect those bites on Accy were from the Yorkie, but they're not as bad as they could be, the dog didn't really mean harm, unlike the bully dog.
Well done Accy, a hero!