It's nothing, just a wisp of cloud.

Avoid Crebain from Dunland! (Borough Hall, Manhattan bound 4 & 5 train)

Avoid Crebain from Dunland! (Spring Street, downtown 6 train)

Avoid Crebain from Dunland! (Brooklyn Bridge, downtown 4,5 & 6 train)

Avoid Crebain from Dunland! (Bleecker Street station, downtown 6 train)

Avoid Crebain from Dunland! (Union Square station, downtown 4,5 & 6 trains)

Avoid Crebain from Dunland! (8th street station, uptown N & R train)

Avoid Crebain from Dunland! (Canal Street station, uptown N & R train)

Avoid Crebain from Dunland! (Cooper Union station, downtown 6 train)

BONUS: PUCK Middle Earth Card, (Cooper Union station bench, downtown 6 train)