Forfar saw defender Jamie Bishop dismissed for a serious foul early in the first half and never recovered as they lost 3-0 to East Fife.
Steven Hislop put the hosts in control after 32 minutes with a right-footed strike from distance that beat Scott Gallacher and hit the bottom corner.
Lloyd Young fluffed a good opportunity when his effort was blocked by Greg Ross after 62 minutes.
Jonathan Smart slotted home from the close range in the 73rd minute to give the home side a two-goal advantage before Robert Linn put the comeback out of reach for Forfar 13 minutes later with a left-footed drive.
Kerr Newbigging fouled Ross Campbell in injury time but Scott Gallacher's free-kick missed the target.