Phase 1 Dust sans is doing what he usually does, Killing everyone to gain the power he needs to kill Chara for good, Suddenly, He walks into Insanity sans, Who has somehow warped into a different universe, But insanity sans has not noticed it because the underground is empty just like it is in his own universe, Dust sans gets confused cause he has never seen this person before, Mainly because it’s an alternative version of himself, And of course he looks identical to sans, Which is why he asks “Why do you seem familiar?”, And Insanity sans being Insanity sans of course responds with “Why..? Well, Let’s just say that…I ‘ M T H E M A N I A C Y O U S H O U L R U N F R O M =)” and then the first fight starts, Dust sans obviously doesn’t know that Insanity sans is, Well, Insane, So he doesn’t use all his power against insanity sans, Which ends up being one of his greatest mistakes, Insanity sans ends up killing Dust sans, When Insanity sans does so, He absorbs a small fraction of Dust sans’s Determination, And then proceeds to walk away. Phase 2 As Insanity sans is about to walk away, He hears laughter coming from the dust pile that appears to be dust sans, The dust pile starts glowing red and then shape shifts into dust sans, Dust sans used his determination to refuse death, Insanity sans turns around, And dust sans now knows that Insanity sans is a great threat, therefore, Dust sans is not holding back anymore, Dust sans then says “You seriously thought it’d be that easy to kill me? I’VE ONLY JUST GOTTEN STARTED” and then the second fight begins, In the end, Dust sans kills Insanity sans. Phase 3 After dust sans has killed Insanity sans, He gets confused, Because he didn’t gain anything from killing Insanity sans, He then suddenly realizes that Insanity sans is still alive, Insanity sans uses the determination he absorbed from dust sans when he killed him to refuse dying, Insanity sans is now alive again, And the final battle begins, In the end, Both of them hit each other with great power, And they both end up dying, But, Dust sans, Manages to absorb all of Insanity sans’s power, And then uses his determination to refuse dying once again, And therefore, He is alive, But insanity sans is dead, Dust sans is victorious, And now has the power to kill Chara for good, And we may not see it in the end of the video, But he succeeds at killing chara for good, Dust sans has finally gotten his happy ending, But even then, The horrors he has experienced still haunts him…