There is a list somewhere... anyone who has large feet hit boxes this happens to. It is why 2,1,2~clone in the corner is so deadly. JIK does the same thing as well. Still... I'm HC 2,1 into the 4... or cutting the string short on just about everyone in the corner. I can see this being SUPER useful when you are right outside the corner and the 2,1,2 string carries them into it. THAT seems to be the opportune time to use this.