I think it depends on if you had a chance of hitting them. If they were ridiculously off the fairway, and not in harms way at all, ever, then you were fine imo. If you had a .01% chance of hitting someone, you should've asked.
Nah, no way of hitting them. They were pretty much in the middle of the fairway, but under a huge tree down a hill about 30 yards out (there is a large drop off after the tee pad). The way I throw that hole sent my disc far out and around where they were at. They were all busy in the tree -- if I would have yelled, I doubt they would have heard me. The guy's problem wasn't with the fact that I could have hit them, rather that I should have "asked permission" to pass them.....after standing there for 5 minutes waiting for the group in front of me that they DID invite to play through. I figured the invitation extended to me as well, but I guess he just wanted to be a jerk.
Garret