You can't fly away from a tiger or a bear, but a human screaming as they are eaten by that one night inspire you to run or hide from something you see as a pred

You can't fly away from a tiger or a bear, but a human screaming as they are eaten by that one night inspire you to run or hide from something you see as a predator. Your feet are not literally rooted in the ground. Also you have ears capable of hearing the noise created by another human.