predators seem to be able to hear well, but they're hearing seems selective.
they probably cant hear everything going on around them such as the wind blowing roughly or leaves rustling. seems they may have to choose on what to focus theyre listening on
an alien could most most likely 'could' get the jump on a predator.
but an alien could definatly get the jump on a predator with there is a ruckus goin on and he is distracted