I have often wondered about that too. I mean, I am with you on that, you can't stop. Are you meant to just stand there? You can't lie down and play dead you will get stomped!!
I didn't see a farm until I was in a twenties. It might have made me a little un-savvy around big creatures, lol!
I'm sure they meant well....LOL.... and I'm sure they knew when he bluffed, if you didn't run, he wouldn't do anything and maybe if I'd have known in advance, I could have done differently, but I didn't, so I did.
Yeah, play it safe. If in doubt, flee!!