i was batteling shinruyu or something like that(is that underwater fiend at the arena)i thought this ais going really slow so i casted haste over rikku let wakka and tidus escape then i casted regen and then protect then i was getting bored cuase that guy is really slow so i thought let's cast haste over him maybe it will speed things up.
well he became thouger but the must important was that the battle was not as slow as it first was