I found this out a couple days ago and this seems to work on most characters, but it doesn't seem to work on characters who have long lasting wake ups or big hitboxs. so characters like Kano, Mileena and raidens shocker.
I'm only like -2 or -3 from the jump kick. If I predict a move I can ex Rekka and blow up a poke or armor. Feel free to blow this up, I'll just try and find something else with her then. She needs more tech anyway
Seems like a risky alternative to B2. Like @Shyyzmm said, there has got to be a way to blow this up. Plus blocking it will really get you in trouble with a lot of the cast.