Am gasit aceste raspunsuri pe un forum.
"You can not do fatalities on android unless you are fighting a boss.You will know when this happens because finish him/her will pop up on your screen and the fatality will automatically be performed"
"You can only do a fatality on a boss in a tower on mobile- when you deafeat a boss the character that delivers the final blow will automatically do their fatality...im 99% thats how it works as I've never seen (or done) otherwise."