Compassion

After talking to Cross about the hunter's encounter with the bloodsucker, he implores you to remove the knife from the wounded sucker without otherwise hurting it.
== Walkthrough ==
There are no natural bloodsucker spawns in Forgotten Forest, so the wounded bloodsucker is easily distinguished from the local fauna: it's albino, it's noticeably slower than normal, can't go invisible, and will run away instead of attacking.
Repeatedly interact with it by pressing F to pull the knife out; the wounded bloodsucker will hit you twice for attempting to remove a knife. Make sure not to kill him.
Along with the wounded one, four normal bloodsuckers will spawn nearby, their area marked yellow on the picture above. They run with the normal speed, can turn invisible, and will attack you, making it easy to distinguish from the wounded sucker.
After obtaining the knife, return to Cross for some special ammo.
== Notes ==
* Before talking to Cross it's recommended to deal with the usual inhabitant's of the Forrest. 
== Bugs ==
* This mission seems to be bugged, the Bloodsucker doesn't always spawn. In this case, try to replay from the "compassion" savegame.