Ple-Sen
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At the very least, I have more reasons to kill a person who is trying to manipulate me than some random stranger.
1) The person has no proof of their words. How will they prove that their promise isn't a lie? Will they point to a random passerby and have them die?
2) If a person possesses such abilities, how can you know that they won't kill you if you happen to choose a "third option"?
3) How can you be sure that the person isn't a higher being, testing people?
4) How can you be certain that killing this person will go unpunished? How can you be sure that you'll be able to pocket their money (they might have transferred it to a bank account)?