He tried, but the entire mentality of this Strange was unstable, as well as his forms.
His tentacles shrunk the form down to a manageable level, as he had before. It was going to collapse on itself, the other Strange had pulled too much power from it. If they took him out of the equation it might work. He drew a portal and his wings around her. He liked this sensation, and he was trying not to. The entities liked it too, of the power they were capable of unleashing. It was definitely her world, her Sanctum.

He was keeping the entity confined, it didn't really like it.