I wonder which patch version of MK they are using. IIRC the 3.0 patch (had the contest advertisement) was the last patch that allowed juggle combos. After that the opponent would fall super fast after the first juggle hit. It kind of ruined the game for the pros.
I remember seeing "pros" in the arcade doing combos with something like 40 hits. They were using that character with the crowbar, can't recall his name.