Slicing William Wood's throat open with a spell was immensely satisfying for Hermione. Though it was an act that she'd committed numerous times over her years as a Death Eater, especially when she was an interrogator, somehow it had never felt so good before. Not even Theodore Nott Senior's execution felt so good. While there was a part of her that could sympathize with the dead wizard and his desire to avenge his murdered younger brother, she mostly didn't care. She killed Oliver Wood because she had to. Either he was going to die alone or she was going to die right along with him. It didn't make the least bit of sense to sacrifice her life for someone that was going to die either way. Anyone who couldn't understand her reasoning was clearly not intelligent enough to understand logic.