Thats a good question. These fight indicators should be placed so when you see them, you have a very limited amount of time to react. It shouldn't be extremely quick, but then again we don't want to have several seconds to react to them either.

a very good question, i dont think anyone has asked aboutthis before. well the indicators r located up near ur caracter's name on the life bar and i dunn but i think gamespot said u'd have to be quick and observant to make use of the indicators