User blog comment:Fistful of Force/Cast heals early, not late./@comment-1871343-20120612124035

Wrong, if you could get away without the heal it is wasted and you can not use it when you need it.

you can bait the enemy with heal to when they dive you under the tower heal-> get kill.

Shield should be casted when the ally starts taking dmg. it does not matter if the ally receives the shield at 80% hp or 50% hp, noone is gone use Garens ult when the nemy has 50% hp