You just release block and press it again, while holding back that is. It's easier said than done, but if you learn the timing and practice you''ll do just fine.

Dude! There are so many combos that you can "parry interrupt".

Here are some:

Kung Lao's 1,1,3,L1 in Shaolin Fist ~ parry right after 3

Ermac's 1,4,3,3,3,3 in weapon ~ parry right after 4

Tanya's b+2, b+1 in weapon ~ parry right after b+2

Mileena's 4,1 in Mian Chuan ~ parry right after 4

Now this one people say it's possible but I've never seen it done before:

Drahmin's 1,1,L1 ~ parry right after second 1 (this is very difficult to P.I because it's so fast when he executes it)

Shinnok's 4,4,1 in weapon ~ parry right after first 4 (works against Sindel's weapon too. Plus I think you can parry after the second 4 right before they do 1 )

Ashrah's 3,4,2,2 in weapon ~ parry right after 4 I think. Also works against Kobra's weapon too

Li Mei's b+3 in weapon ~ now this one's tricky to P.I. cuz this move consists of three hits so you have to watch closely. I think you parry right after the second slash. It usually happens to me. Also works against Sareena's weapon too.

There are many more where these came from. I'll update once I find out the other ones.
*NAKM*

^^There's your answer.

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