Final answer:
Haemon attempted to murder Creon out of rage and, failing to do so, killed himself next to Antigone's body.
Step-by-step explanation:
Haemon's reaction to discovering that Creon has entered Antigone's tomb is one of immense despair and tragedy. On finding Antigone dead by , Haemon, overwhelmed with grief and anger towards his father's cruelty, attempts to murder Creon before taking his own life.
He fails to kill Creon, and instead, turns the sword on himself, dying by Antigone's side. This act of double sorrow - Antigone's and Haemon's subsequent death - marks the tragic culmination of Creon's refusal to heed the warnings given to him about the consequences of his harsh actions.