Allies to player character
Will I take friendly fire from allies, units summoned through a tear, or possessed enemies?
If I will take friendly fire, what is the AI behavior when they are firing and I am in their line of sight? Do they stop firing when I am in their line of sight? Or should I try to avoid getting in their line of sight to avoid them shooting me? Is damage dealt to me by allies 100% of the normal damage or is it reduced?
Player character to allies (including units summoned through a tear and possessed enemies)
I've noticed that possessed automatons will take reduced damage. How does this work? By how much are damage to possessed enemies or allies reduced? Will allies (not necessarily possessed enemies) take full damage from the player? Will Vigors still help deal bonus damage to allies?
Question by @Alex: Will summoned/possessed enemies turn hostile if you shoot them?
Enemies to each other
Can (non-possessed, but allied) enemies deal damage to each other? How does this work? Do the they deal full damage to each other? Do some enemies exhibit 'Doom-style' infighting behavior?