Basically wars according to Yoshi were suppose to time their heals ie inner beast with the healers to prevent overhealing.

So for example lets say your on titan phase 5, and titan hit you with rock buster and bombs, and mt buster and you trilled of battled.

Whats suppose to go down is, the healer is suppose to heal you up to a point then your suppose to heal back the rest of your health and the healer stops healing you and focuses on the rest of the party. I think its called holding wrath stacks. Obviousily it wasn't really applied to the real world and over healing or underhealing occurs when you blow wrath stacks to earily and too late making wars not as healer friendly as paladins are.