One Thing in Common

[Pitchwife]

Originally Posted by Lindolirian

Both overlooked the evil deeds of a companion's past. Beleg stayed with Turin despite his outlaw ways and Frodo accepted Gollum as a guide despite all his evil.

Ah, I'd almost forgotten about this! Good guess, Lindolirian - actually, this could be a perfectly valid answer, but it's not what I was thinking of. You're very, very close though - it has to do with Túrin and Gollum, respectively. Try to think of specific situations rather than their general attitude towards their companions.