Assuming nobody else is immune and has the power to restart it. If someone else did have the power to restart time, I think the thought process would go:
Bob: “Aha! I have the power to stop time with the snap of my fingers”
[starts to snap]
Bob: “Oh wait! What if I’m not immune!”
[time is frozen]
Some dude elsewhere: “Weird, time stopped again! I guess I’ll take advantage and rob this bank.” Then, later “Ok, got all the money, now I’ll just crack my knuckles to restart time.”
[time is unfrozen]
Bob: “Wait… I just snapped my fingers and time didn’t stop! I guess I don’t have that power at all!”
Assuming nobody else is immune and has the power to restart it. If someone else did have the power to restart time, I think the thought process would go:
Bob: “Aha! I have the power to stop time with the snap of my fingers”
[starts to snap]
Bob: “Oh wait! What if I’m not immune!”
[time is frozen]
Some dude elsewhere: “Weird, time stopped again! I guess I’ll take advantage and rob this bank.” Then, later “Ok, got all the money, now I’ll just crack my knuckles to restart time.”
[time is unfrozen]
Bob: “Wait… I just snapped my fingers and time didn’t stop! I guess I don’t have that power at all!”