Dog fights involved a lot of growling and bared teeth.

You can't hear any growling in the video so you can't just assume that. I also don't see any bared teeth.

A lot of barking, a lot of running around like in this video, like how'd they'd hunt something big together.

From a lot of the videos I've seen of dog attacks, the dog charges and goes for a bite. Here's an example. In your videos, the first dog ran straight for the person he wanted to attack, but it had to move to the side a bit to go around someone. After that, it needed circle because there were too many people fending it off. The second video is similar because they were being fended off.

But either way, even if dog attacks are not all about running in, just because some dogs circle instead, that doesn't mean that all circling is a dog attack. I just visited a friend yesterday who has a harmless dog. She runs up to people while barking, but last minute backs away or runs around in a circle. I don't know exactly why, maybe she gets scared or shy, but this kind of behavior does not instantly mean it's a dog attack. And for the record I've seen a lot of dogs do that with people they don't know.

I don't see how you can tell the difference. It really just seems like you've seen some attacks and jumped to conclusions thinking you know it all, feeling comfortable saying that you know for sure that they were not friendly and ready to attack. But if you can disprove that then I'm all ears. What you've said so far hasn't proven anything.