This is movie/lore accurate
If the predator loses its biomask, it still has thermal vision (albeit distorted and not as clear)
This would be very useful in night maps when your mask is destroyed. You can still see in the dark. Its ok to lose mask features such as shoulder canon aim, target isolation and overhead indicators
If not, then give the ability to the predator to destroy Fireteams night vision goggles with a headshot.
Make it fair