You can't, but you can protect yourself by having a trophy system around, or being inside a building.
To destroy a BTR-80 find a Rocket Propelled Grenade 7 (RPG-7) and fire at the BTR-80. It should be destroyed by a single hit from the RPG-7. If you cannot find an RPG-7 use a laptop that controls a Predator drone. Use the Predator drone's missiles to destroy the BTR-80. One direct hit from the Predator's missile will destroy it, same goes for an indirect hit, the splash damage will still destroy it. You can find the laptop in the mission Wolverines in ACT II. It is compulsory that you find and use the laptop in this mission. The laptop can only be used during the right event in the game. In other missions you must either use an RPG to destroy the vehicle or run away from it. Note that bullets and grenades will NOT damage this vehicle.
Yes, you can play as a Predator in the Alien vs Predator game.
yes
no you dont destroy your game.
Alien Versus Predator
Aliens versus Predator - video game - happened in 1999.
Alien vs Predator - Jaguar game - happened in 1994.
Alien vs. Predator - arcade game - happened in 1994.
Alien vs Predator - Jaguar game - was created in 1994-09.
entertainments and arts
Aliens versus Predator - video game - was created on 1999-04-30.
Alien vs. Predator - arcade game - was created on 1994-05-20.