The thing is that by running away, you expose yourself even more to danger.
It’s like training for ambushes. Instinctively, people back away from danger. If you start backing away in an ambush, you’re dead. The instinct is completely wrong.
The best response to an ambush is to attach into the ambush. It’s not a sure thing, but your chances of coming out of it alive increase that way.
And most ambushes are designed so that if you run, you’ll just die tired. The ambusher doesn’t want a confrontation.