Fire Claw
Fire Bird always starts his attacks with Fire Claw.

One hero will be engulfed by fire and the only way to convince the claws to let loose is hitting them hard.

Footloose
Allthough I don't know if Firebird knows the film, here is his interpretation of the classic movie.

Meteor Wings
If Firebird streches his wings like shown here he will perform Meteor Wing.

This attack damages everyone on the battlefield.

Ball of Fire
Even without wings Firebird is not helpless.

Bouncing around like a crazy pinball he causes damage to everybody hit by him in this form.