The movie audience for a summer blockbuster based on an 80s toyline can not be expected to know about obscure comic books or multiversal singularities; what happens on screen is all that counts. Having said that...
It is interesting that the movie novelisation just has Demolisher saying his final words after Prime's attack with no comment or kill shot from Prime. In the comic adaptation Furman has Prime say "I wish there was another way" as he delivers a fatal blow. Both seem more 'right' and suggest the adaptors weren't fans of that scene or the script was rewritten at a late stage.