Did you know cows have a dental pad on the top in the front of their mouth? There are a few teeth on the bottom in the front and then there are molars on both the top and the bottom further back in the mouth. Apparently it's part of being a ruminant animal. Dr. Lindsay has a very succinct explanation: https://agriculturalwithdrlindsay.com/tag/dental-pad/
Those two young Shetland cows thought about squaring off again but the one decided to shake it off.
Yes, there were flies but the cows looked healthy and had glossy coats, clear eyes, ears, and muzzles and fairly clean back ends. They're cows-there are going to be flies. I found an interesting article about mixing garlic powder into their food to make the cows less appealing to flies. https://blog.redmondagriculture.com/cattle-fly-repellent-garlic-is-worth-its-salt