Even if it did a PW:S is not going to make the player able to survive 1.5m damage. If it does affect the damage taken, the debuff for another shield wouldn't ( i assume) be up for every energy ball, so the tiny amount of absorption won't be enough to allow the player with the barrier to soak an extra energy ball over the course of their barrier lifespan, so its probably irrelevant to use on the soaking player.