White Cranes response reads as: R Commit, discard 1 momentum: After your opponent plays an attack with at least 2 keywords, discard it from their card pool and cancel its effects.
So correct me if I am wrong but if your opponent plays an attack as a block and that attack has 2 or more keywords then could you use White Cranes R to discard it and negate the block thus allowing your attack to go unblocked?