Barrier?

I cannot do that.

Yes, it's that gap over there.

Right now, it's barely big enough to let cats pass through, but if we leave it alone, who knows if that hole will grow any bigger.

If you do that, no new children will be able to come through!

While I still can, I can block...

What's the trouble in only letting cats through!

Whether it's troubling or not is not the issue here.

The management of the barrier is a job that my master bestowed upon me.

I must seal the barrier.