If I rez at an altar there is not enough time to get to the fort before the buff wears off. Its not just me either. We kill Ignis all the time at Samal save. Alsius all the time at Aggers. All classes. UM is not bullet proof
(esp when 10 different toons are casting a knock/slow)
Just make it distance dependant, not time. Then people can just stand there if they want. Move the war into the rest of the wz instead of concentrating it at altars. Seems like all we ever do anymore is hit the altars. And why not, it is excellent rps and quest credit.