in regard to puff
Coca-Cola has erased its famous script from its new cans. Gone, puff, vanished, leaving behind a naked white ribbon, fluttering against Coke’s theater-curtain-red backdrop.
I want to know which word class "puff" in the above is, a noun or verb ? if it is a verb there ,why not use its past participle ,puffed ,like other two words, gone and vanished.