After you identify to perpetrator/victim, you oughta keep a safe distance to prevent being spotted too early.
Usually, this takes place only after that person produces a gun or starts planting an explosive.
Only then, can you step into action.
However, this does not means that you lose the opportunity to complete this mission, irreversibly.
It may still activate once again, later into the game.
He should then dart away.
The only exception are the situations in which the bandit already targeted his gun at the victim.
While chasing the bandit, it is best to try handling them down in melee, i.e.
to catch up with him (the acceptable distance is 5 meters) and press the melee key/button.
a transformer, when the bandit stand near it).
Note - there are separated situations in which there may be an additional obstacle to completing the side mission.
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