After an actor being shot, the attack AI kicks in and execute checking out attacking direction routine. I haven't found any set player priority or move state will override that checking-out routine.
I have limited success with the following setup. Basically to prevent the checking-out routine to happen for the attacked actor's teammates.
Raider A, B, and C are set about > 4 standard tiles apart (1 standard tile seen in the View -> Show Poly)
Raider A, B, and C are in player raider.
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Trigger 1 - Silencer on
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Condition
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player human has more than 0 items (silencer) tagged equipped at anywhere
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Action
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Set player raider priority communication to 0
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Trigger 2
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Condition
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player raider has more than 0 is alert at anywhere.
player human has more than 0 items tagged equipped at anywhere
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Action
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Change player raider alignment to player human to 0.
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Scenarios
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If human shoots any raider with no silencer equipped, the raiders will follow the gun sound. I suspect the communication priority default is level 5.
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Scenarios
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If human equips silencer, the communication priority is 0 for the raiders. At communication priority level 0, actors won't communicate with each other about 3~4 tiles away if shot.
If human shoots a raider with silencer equipped, only the raider being shot will follow bullet direction (which is semi-realistic).
Once the raider is dead, the nearest living raider to the corpse will go and check out the corpse.
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Problems
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Nearest living raider checking out the corpse;since the raider is neutral to the human, raider will not find enemies near the corpses and return its original task. Overall, this is semi-realistic to real world scenario.