Mami Tomoe was fighting a witch named Ophelia who was also her former magical girl student Kyoko Sakura who had turned into a witch.

“Mami you won’t escape.”

Mami then grabs her musket and points it into the roof of the labyrinth causing half of the roof to fall debris falling and a rock separated the two and Mami then collapsed due to fighting a lot and transformed back into her pajamas and then Ophelia teleported to her and grabs Mami and brings her to a bedroom and and places her on it and places a chain around her leg, so Mami could only sit on the bed and walk short distances and she used a bit of her powers to manipulate Mami’s mind and then Ophelia closed the door and leaves.