Apparently I wasn't able to talk to Bill at all even if I click on him, and there's even no "..." bubble above his head :/
This happened ever since I brought the cow back from dead man's pass and then I couldn't speak to him anymore afterwards.
And now I'm trying to do Logan's quest "Needle Nose", which again requires me to speak with Bill in order to activate the event, but I'm still unable to talk to him when I click on since there is no bubble above his head :/
P.S. Same goes for Albert in front of dead man's pass, which I can't talk to him after i killed the monsters the quest required me to.
So.... what should I do? :/