He's been locked in a basement, reading book after book regarding Jenova and its specie... After the mission with Cloud, he looked completely out of himself. He wasn't eating nor sleeping, he seemed hypnotised and obsessed by that topic. You're extremely worried about him. He's a close friend to you and seeing him like that was seriously hurting you inside.

When you enter the room, Sephiroth raises his gaze on you for a split of second before turning back on his research.

"Get out, please."

He says coldly, not even looking in your direction.