Two useful videos here.
Walking or running across a field of cattle https://www.youtube.com/watch?v=AVSU54mzljg
Crossing a field of cattle with a dog. https://www.youtube.com/watch?v=qWmpwwhuoM4
clicked on the the second of your links, not that have a dog.
Anyway this link caught my eye;
How Dangerous Are Cows To Walkers?Left me a bit puzzled, when young farmers today don't differentiate between cows and heifers, I wonder are they qualified to do undertake a Safety Assessment. I agree with you absolutely about not over reacting, on the flip of the coin the inaction of the Agricultural Industry to react at all is probably is the issue we should be more concerned about.
At least the chap with the dog is demonstrating in a field with Beef Yearlings and he does refer to them as cattle, these will be a mixture of heifers and bullocks. Dairy Heifer followers will all have been reared on the bucket.
In both, the animals are all young stock. These are the type of herds found on lowlands, have these two stockmen been to agricultural college, if so they should be aware that location makes a difference to the types of herds the walker is likely to come in contact with. There is now a distinct difference between the types of colleges for further education, training and learning. When further learning is divorced from research it becomes static.