The movies in the Shit Cops Now Universe are not presented in any specifical chronological order. They are all kinda all over the place. This should hopefully clear some Shit up. I mean, I guess this is just my interpretation but I just always assumed everyone got this out of it.
Sometime before SCN, Blazer and Snowman caused and/or witnessed the death of La Sombrerbra. (Dead Guys Before) After she died, The Wizard stole her body and tried to take it to his old friend Stomper to convince him to punch it into Wizard Dust. (Bitch Punch Dust).
At some point after this, El Sombrerbro discovered that his sister La Sombrerbra was dead, and sought revenge on those who done killed her all dead.