From Sonic Retro
Fire Launcher is Team Dark's variant of the Fire Dunk in Sonic Heroes. When in Power Formation with Omega as the leader, Team Dark can enter Fire Combination by pressing , which sees the robot clutch Shadow and Rouge as spin rolling spheres in his metal claws.
Omega can fight enemies hand-to-hand in this configuration, or jump into the air and use Fire Launcher. This attack sees Omega blast his teammates at enemies as impromptu missiles, and can also be used to break down doors and other obstacles.
Unlike the Team Chaotix and Team Rose versions, Fire Launcher has to be used while jumping; it cannot be done on the ground.