And Hermione doesn't respond to his statement, knowing how dire the situation is right now. She has been battling to keep this spell contained for quite some time, while Crookshanks was on his hunt. And she is tired, but the job is not done yet.

With all the spell ingredients finely ground into a powder, she twirls her wand, forming a mini vortex into the air. She stands up, slowing controlling the vortex, until she can guide the spell towards the door. "Colloportus!" Hermione casts another spell. The spell slides into the cracks around the door, forming an almost welding effect on the edges. A black slime starts to pool at the top of the door, and slowly moves its way down.

"Back away Jim..." Hermione crosses her arms, watching her spell work to lock the door solidly. It is a combination of a shielding, warding and welding spell that that the door is protected three different ways. And the black slime covers more and more of the door, the pounding on the other side subsides, until the spell has completely blocked off whatever was trying to get to the other side.