En wowwiki encontre algo acerca del last stand, un poder que se llama distinto pero es igual que el survival instincts.

This ability can save the raid during a boss fight or an unprepared pull on trash mobs. Make sure to let the healers know you used it as a warning to keep your health up because the effect will end and the extra health will be gone in 20 seconds.

La ultima oracion que subraye. Dice que te asegures de decirles a tus healers que tiraste el last stand, pq cuando termina el efecto la vida extra se va.