Recently got Poe from the free giveaway, and I gotta admit I haven't used him much, but the few times I did, i never saw expose being applied to anyone.... Ever.
It says 50% chance, but I've used his skill 4 times, and it applied expose a big whopping zero times.....
So that's a 50% fail on about 20 attempts. (4x 5 opponents).
Is that normal!?