Firefight is a special gametype where you get to play as a Firefighter and you put out the flames with your liquids, no spontaneous combustion will stand up in your mighty power. You can play by yourself if you have no friends, or if you do have friends you can play with up to 3 other d00dz. This mode is present in Halo: Reach and Halo 3: ODST. Please note that Unggoy are liable to pwn you when you play this mode.