Lets say that hypothetically that Telltale gives the choice after completing all the episodes to go back and change/stop a death but due to Newton's Third law; "For every action, there is an equal and opposite reaction" someone else must replace that person death.
What this basically means is that if you save a person, someone who is in the same area must die to replace that persons death. So lets say you save Carley, as a result at random;
- Ben could be shot
- Lily could be stopped but shoots herself in the process
- Kenny could move in the way and get shot
- Duck or Katjaa could be hit by a stray bullet.
One of those 5 must die right there and then for saving Carley but you don't know who. For Larry either Kenny or Lily must die. etc etc.
You can expand your thinking on some situations so for the Doug/Carley scene you can save both but that would mean one of the people outside the Pharmacy would die by going the wrong way etc etc.
Note: Clem, Lee and Walking Dead tv stars will have plot shields meaning that they are unaffected by your choice and can not die.
So would you like to see something like this at the end? Whose death would you change? Or would you not change it because of the possible consequences?