Mortal Kombat 1 Rain/Cyrax Wall combo Portal setup

Annotation explained:
F= Forward
B= Back
D= Down
U= Up
K= Kameo
J= Jump (mostly meaning you are airborn, may require you to jump)
~= Cancel string into special move ( If kameo is inbetween the string and the cancel it means do it in the middle.)

F21 ~ K(HOLD) ~ BF4 Hold B, BF1(HOLD), DDU Hold B, J142 ~ K ~ DB2, J142, DF2

Falling from portal low mix 1 bar (As shown in this video) :
J2, B2 ~ EX DB1, J243, 2 ~ L2+R2 (FATAL)

Falling from portal Overhead mix 1 bar:
J2, F32, B2 ~ EX DB1, J243, 2 ~ L2+R2 (FATAL) (Midscreen end with 1 ~ L2+R2)