Picked up the game yesterday and played it once by myself. I have to say, there were some memorable moments in the game, especially when Gandalf saved the day when the situation seemed the most hopeless.
My first question is, if nobody commits any characters to the quest, do the players get any threat damage that phase? I think not, but it never hurts to be absolutely sure.
My second question is, do you add in engaged enemies' threat values when determining if you were successful during the quest phase? I think you do? Only the location being explored doesn't add it's threat value to the mix.