The player first encounters Forty on their first visit to Paradise Falls. An slave attempts to escape but Forty detonates the Slave Collar around the slaves neck, causing their head to explode directly in front of the player.
The player can distract Forty during the Rescue from Paradise quest by passing a Speech check. The player tells him that he isn't being paid enough by Eulogy. This makes him leave the area allowing the slaves to escape back to Little Lamplight.
He is somewhat tougher than your average opponent, although he shouldn't be enough to overpower you, even at low levels.