Dont' forget Web of Disruption. While it's unlikely that when the hex ends interrupt will catch someone in a critical skill... well, it doesn't hurt.
And there's always the chance that someone could remove the hex by accident or miscommunication when they're doing something important.
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Niva Reikan: Warrior/Monk, Kurzick Champion
Arcturus Highwind: Paragon/Ranger
Pet: ROUS
Walker Tam: Warrior, Defender of Ascalon in Training
Nikolia Vasburg: Ritualist/Necromancer