"""Interesting star wars theory: I think Han is one who activated the  lightsaber, not Ben. """"I know what I have to  do but I don't know if I have the strength to  do it""""... """"will you help me"""" Han: """"yes  anything"""" Kylo pulls out his lightsaber holds  it in both hands. Han reaches down grasp  the center of it. We just see their faces but  notice they aren't struggling. Lightsaber  activates and goes through Han, Kylo looks  startled for a moment and says """"thank you""""  Han touches his son's face and falls into  the abyss.  Kylo/Ben journey to the dark side required  him to kill his father. Han knew this and  knew his Snoke would kill his son if he  failed this task. By Han activating the  lightsaber himself Kylo can still go back to  Snoke and report that the deed is done...but  the fact that it wasn't really him that killed  his father ensures there will always be a  smidge of light left in him that can never be  snuffed out. Thus...eventually...Han's  sacrifice will succeed in his promise to  Bring their son home. Interesting star wars theory"""
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