The mother stated at the end I think they were going to feed them to the tiger to get rid of them. Beckett I'm sure has sides to her that we've not seen before because of her emotional wall that is starting to come down now. I will say that the only thing that I didn't really like about the episode is that it seemed a little too convenient that they were rescued just in the nick of time. I know that there was probably no way else to resolve the plot but still...and they moved that hatch really easily after it was made clear they weren't able to even push it up against the wall in the first place. Unless they removed all the chains that were inside before propping it up onto it's side.
That's what I was thinking as well. It was a little too easy in terms of the way that they were rescued.