Its not a 1-frame link and the other character can be blocking, they’ll still get fucked up.
How it works:
Get a completed special move or limb outside of the screen before the character comes in.

How to do it:
1) Killing a character with a throw puts you in a special state that allows you to “superjump” after killing them…(otherwise, you cant superjump or do special moves until the 2nd character comes in.) The weird superjump puts you at the perfect height to stick a limb out.
2) Doublejump characters can do this easy. Kill the character then double jump.
Cyclops – lp, hp
Chun Li – lk, mk, hk
Cammy – lk, hk
Sabertooth – lp….he cant doublejump but he is the tallest in the game, so he doesnt need one.
3) Free falling: kill the character with a super that ends in the air. While falling stick a limb out…lol.
Charlie – flashkick super
Cammy – cannon drill super
4) Flight: just be at the right height after you kill them
Storm, magneto