Each time you hook a Survivor other than your Obsession, you gain +1 Token:

• For as long as the Obsession is alive, all other Survivors suffer from a stack-able 2/2.5/3 % per Token Action Speed penalty to Repairing, Healing, and Sabotaging, up to a maximum of 22/27.5/33 % or 11 Tokens.
• The Obsession is unaffected by this penalty and instead granted a permanent +33 % Action Speed bonus to Unhooking and Healing other Survivors.

You can only be obsessed with one Survivor at a time.

"This isn't a man..." - Dr Sam Loomis