User blog comment:SirAston/Thoughts and suggestions regarding Summoner Spells/@comment-5545048-20130808153408/@comment-5556439-20130809221614

^ Riots said thats the only thing that can save Heal as a spell, as it would be worthless comapred to barrier if restricted to one champ but doesnt do enough when used on everyone.

Also, its the only realistic change because you are never going to use heal when your 50%-100%, only when your below like 25% or so. The missing HP is the best idea.