Dunno man, if I'm PL, I'm always looking out for that ember. Second I see sleight, I'm hitting doppelganger to disjoint most of the damage and hopefully blink towards him.
But if you disappear it ends sof early and you'll have a one second of heads up to scram to a respectable distance and sof's cast range is 700. PL's phantom rush max range is 900. You have 1 sec to clear 200.