Ahh, you have to use X or Square (ps4) to steal it. However, the CPU tends to know the right times to throw it and they usually launch them then. That's why they get through. However, I've poked a few but they do get them off a lot. It's the mismatch. If you're in the post as a PG defending a C and he throws an oop, the dude is going to use his reach to leap over you and grab it. The same goes the opposite.