[Elizabeth stares almost resentfully at the spot in the air where the tear had been.]

Because it only seems to open tears to other versions of this world. I'd rather be stuck in this one, where we know a little more about what we're facing, than go into another with who knows what variables.

[The kitten has climbed up onto her shoulder while she opened the tear and she scoops it up in her arms again.]

They're not big enough to go through, anyway, not like they are in Columbia. Just big enough to have a look through, and I suppose to bring back objects from the other side.