This last weekend there was a cultural festival in these parts. All kinds of films, literature and ethic food and dance all over downtown. When darkness fell, fires lit up and you could watch a show with real horses and knights clad in armour thundering forth. Guess where I was standing?
It was quite amazing to see a 600 kg horse come galloping down a field of gravel, the ground thundering and loudspeakers playing Ramstein. The fact that the horse had a lad or lass on its back wearing plate armour and swinging a sword or lance didn't make it less impressive! With people breathing fire for the audience and the jousting knights sometimes having swords lit with flame it was quite a show!
Now, imagine that beast and warrior coming charging against you with intent on your life.
I would run.
I'm suddenly feeling that having a PC make a morale check to stand his ground when facing a dangerous monster makes a lot of sense.