A second punch SLAMMED against the inside of the barrier, causing it to ring like a bell, but it held.

Then the pink fog starts draining away from her mind and Bai Lin started coming back to her senses, as Undyne's magic cut the Siren off from access to Lin's mind. She blinked a few times and shook her head.

"Wh...What just happened? Why am I in a bubble?"