To perform the ultra stylish cinematic killer move, Dante needs to wait for the enemy to be dazed or fill up his "Super" meter.
When the conditions are met, he will need to move in close to an enemy for a context-sensitive command to appear on-screen.
Pressing it will trigger some super-awesome, stylish and cinematic moves where Dante beats up the enemy with style, while all other enemies in the field stand and watch. Dante is also invincible during this.
If Kamiya is gonna do something like that, DO NOT WANT. --- There is no such thing as a "Quick Time Event done right". A game that has Quick Time Events is a "video game done wrong".