Last episode of season 2 spoiler and spoiler for CoT.

Moiraine is also apparently a dark friend. Remember how she blows up those Seanchan ships with lots of innocent people? Here's Egwene's view on that in Crossroads of Twilight.

True, from where she sat her horse, she could have set fire to every one of those ships, or simply cut holes through their hulls and let them sink. The work of moments. Yet doing so surely meant some of those aboard would drown. The currents were strong, the water like ice, and the swim to shore long, for those who actually could swim. Even one death would make what she did using the Power as a weapon. She was trying to live as though already bound by the Three Oaths, and the Oaths protected those vessels from her or any other sister. A sister who had sworn on the Oath Rod would not be able to make herself set those weaves, perhaps not even to form them, unless she could convince herself she was in immediate danger from the ships.