This has been really annoying me and I can't find any real discussion of it anywhere.
When Legolas' ability says he has to particpate in an attack that destroys an enemy to place progress tokens, does participate mean anytime he attacks and kills an enemy either by himself or with other characters? From the rules I've read, it seems that participate usually means in conjunction with another character (not necessarily another players' characters) i.e. the ranged description. Normally, I think particpate means "involved in an attack" in which would be either scenario descibed above but I'm starting to think the word participate means something more specific in this game.
I think Brand's ability makes more sense where he has to attack an enemy engaged with another player. The ability seems to trigger regardless of whether he attacks alone or with other characters as long as the enemy is engaged with another player.
Thanks!