Well, I was hoping the mechanic would be used for more strategic combat than for straight puzzles. For example, the first thing I tried to do was use a ghost as a distraction to sneak up on an enemy.
My initial hope was that the enemies would either repeat their previous fire pattern each round or else be willing to target a nearby ghost, but they seem to always target the living player and their shots only hit the ghosts incidentally.
This meant that since my reflexes are old and I had trouble getting close, the best strategy I could come up with for avoiding shots and dealing with enemies was simply to fill the area with ghosts to have the highest chance of them intercepting enemy fire.