Sometimes its just a bad tank. I mean WAR are harder to heal than PLD, due to a lack of damage negation, this is where a SCH helping you out as a WHM should work, giving them the negation they lack, but honestly, I've seen WAR that were hard to heal, and WAR that were easy to heal, and I have to believe that depends on their own player skill and knowing how to effectively play WAR without being a hot hp mess. Still going to take more dmg than pld regardless, but I notice a lot of time a SCH and WHM working in tandem to heal a WAR, is a lot easier for both healers, than two whm, or two sch (definitely easier than two sch, two whm only prob is over heal)