LoS is easier on the healers, easier on the players, but bigger punishment brambles is easier on the targeted player, more work on the tank, more work on the healer. If LoS was not intended there wouldn't be the huge gap in time between when the flower disappears and the move goes off. If they wanted the player using LoS, it would just eat you right after the flower disappears and the flower would stay up longer. If this is an exploit then Using Los to dodge both the fire and the special atk on the second boss of WP is an exploit, which it's not.