You were in Tartarus with Junpei and you two were goofing around until a Huge Shadow Appeared out of Nowhere and Startled you both, but Junpei Quickly Snapped out of it and pulls out his Evoker, and Sword.

"Tch! Get ready for a Fight Partner!"

He says with a giddy and joyful expression on his face, despite the situation he was in