[enthulhusiastic]

As a non-expert who has basic fucking sense:

first mistake is to approach an animal you know is hostile.

Also that specific owner of the lip-biter should be in prison. If someone actively being bitten in the face can maneuver a door closed on the dog, then so can the owner.

The owner didn’t try hard enough to help. A person in a dire situation figured this out. The owner did not. The owner is not fit for owning this dog if their level of control is less than someone who’s in panic.

There is no way this person is not responsible for buying the dog and then not acting to prevent the attack.