The other day while driving at night a raccoon(I think) ran across the road a hundred feet or so in front of my truck. Its eyes reflecting the light of my headlights was the only thing that gave it away.
It got me thinking.
Why couldn't alien eyes reflect marine flashlights?
To keep it balanced, it would be best if alien eyes only reflected flashlights while the alien was using alternate vision. The effect would make sense that way as well, because presumably the aliens eyes change when seeing in the dark. Anyway. This adds a subtle dynamic to stalking marines in pitch black, not only with positioning to avoid giving oneself away, but with strategic use of the alien "night vision", so as not to chance being seen. As in real life, I would expect an area outside the cone of the marine flashlights(to the sides, and towards the front after the light fades) to cause the reflection.
Something like this would help give stronger purpose to both vision modes, and keep players from over using the alien "night vision".
In addition to the gameplay elements, it would make for some striking visuals. Imagine pausing in front of the doorway to a darkened room, and switching on your flashlight only to see five pairs of eyes staring back at you. Eerie.
~Otis B. Driftwood