This bit, like most of the episode, is taken from 1993 "X-Men" comic crossover event "Fatal Attractions." The episode ends with a shot recreating a panel from "X-Men" #25 (drawn by Andy Kubert ...
It is pretty much a beat-for-beat redo of the iconic sequence from 1993's X-Men #25 (by Fabian Niceiza, Andy Kubert and Matt Ryan)... That was the biggest turning point of Fatal Attractions ...