Yup, I ended up having to do that one with zero motion tracker use and vice-like buttock clenching.
The big thing to keep in mind is that you rarely have to use a locker, there's usually a desk/stretcher to hide under or an obstacle to duck behind. And whichever you choose, darkness is always helpful. Keep moving whenever it's out of view, walking should be just as effective as crouching if it can't see you; staying in the same area for ages seems to rile it up when it's hunting.
Depending on your difficulty level and the alien's state of aggression, a flare can be REALLY useful too - sometimes it just sits staring at it for ages.