Unknown Factors {TVD/HP}

The Mikaelson's wake up in their coffins to notes from there brother. Notes of apology from him, apologies that explain his actions. What happens when they see Niklaus Mikaelson of all people actually nervous? What happens when he suddenly panics and runs off with the siblings running after? Why do they find him crying over a woman found dead on the floor?
(takes place in early 2000s)
(I do not own the Harry Potter series or The Vampire Diaries)