Incendiary hitting a ghost

Here I am a ghost.. I am in the party of the person incendiary'ing/fireballing but still a ghost Someone utters the words, 'fireball'. A ball of fire erupts from someone's hands, engulfing the area in flames. Tarwin fades into existence. Tarwin's fireshield and airshield renders the explosive ignition ineffective. The cloud of flammable gas ignites in an incendiary blast! Tarwin's airshield renders the concussive blast ineffective. Tarwin is unaffected by his own blast of fire. Your concussive blast MUTILATES you! You sure are BLEEDING! A nearby building catches fire! You hear something's death cry. Tarwin is unaffected by his own fireball.