no i would freek out and try to get away.
It depends. If you're not prepared for it, real terror tends to make people freeze in place.
' is a great example of that. Look at the reactiosn to the Rex. Then, most of all, look at how the kids act with the raptors.
On the other hand, if your'e already in a crazy, war-type situation, with all kinds of stuff going on around you (assuming that you are already
on the move), then you're more likely to go on the run.
Being cornered in a dark place of shadows, however, will make most people react by paralysing in fear. Especially if looks as truly alien to our expectations as the Alien (or unmasked Predator) would do.