I found this today and I think this can be useful against characters with slow pokes, I tested this vs Kung Lao and you have to be on point with your poke, otherwise you'd either trade or get thrown, Kung Lao can't answer back with F2. You have to do the same timing that you see on the screen for the OS to come out only on block.
Note: I don't know if this is known already but if it's already here then you can delete this I don't mind, I just couldn't find a Cryo OS thread.