OK, I'm starting the Companion's quest line, and I have to go train with a guy named Vilkas, as soon as I follow him outside, he cuts his dialogue short and starts attacking me, why?

cool spoiler bro

have you seen the other forums yet?

http://www.gamesas.com/index.php?/forum/178-skyrim-cheats-hints-and-spoilers/

Really? You're gonna call that a spoiler? God, people here got so freaking sensitive. I hardly consider saying that I have to go train with someone a "spoiler".

What do you think training means? He wants to test your mettle, not pick roses with you.

Hit him back.

Anyway, I think I figured out why I was attacked, I started the quest at night, and I guess at night where I follow Vilkas to is off limits. Waited a few hours and then went outside, and all was well.

@issact No, he stops he dialogue line out of no where and started randomly attacking me(complete with battle taunts) without saying anything.

Have you Showered?