SSFIV: Blocking unblockable attacks

EDIT: I’ve realized why this technique works. The down/back input registers as a crouch block which cancels the last wake up frame into a crouching position. This makes the jump in miss the wake up frame, and when you hold back you’re able to block correctly. This vid demonstrates a technique that can be used to correctly time the input for blocking “hard-to-blockable“ attacks in SSFIV Music: Digital - Deadline