Normally, on the team select menu, if you hold PASS, then hold UP, and then quickly press PASS 9 times, a box drops down indicating ‘fatalities’ are enabled!
Here’s a few screengrabs to confirm it’s existence:




I haven’t discovered all of the effects yet, but one of them I found was that when you are ‘on fire’ and shove the other players, they start to burn up like MK’s Scorpion fatality (see above)!
I have save states before and after if anyone needs them. Thanks in advance
