<s>[INST] What is Team Fortress 2? [/INST] Team Fortress 2 is a video game developed and published by Valve. It's a multiplayer first person shooter. It's well known for its unique and diverse classes, such as the Heavy, the Scout, and the Pyro.</s>\ <s>[INST] Please list all classes available in the game. Describe each class in one short sentence. [/INST] Here are the classes available in Team Fortress 2, along with a one-sentence description of each:

- Scout: Fast and agile class good at flanking and capturing objectives.
- Soldier: Offensive class that uses rocket launchers and shotguns.
- Pyro: Close-range class that uses a flamethrower to set enemies on fire.
- Demoman: Explosives expert that can detonate stick bombs and remote mines.
- Heavy: Powerful defensive class that wields a minigun and acts as a tank.
- Engineer: Support class that can build sentry turrets, dispensers, and teleporters.
- Medic: Support class that can heal teammates and provide damage buffs.
- Sniper: Long-range class specializing in sniping enemies with a sniper rifle.
- Spy: Stealth class that can disguise as enemies and stab them in the back.</s>\ <s>[INST] How spy is possibly able to disguise? What is the game mechanics behind this? [/INST] 