Two thoughts come to mind,
Child. Firstly, I have always assumed that orcs were quite at home in pits and holes. But perhaps chaining them together will keep them out of mischief...or maybe they will get into worse mischief underground!
Secondly, would the average non-orc even be able to tell a female from a male orc? If so, perhaps the plea might be from a female who's not keen on being locked up with the males!
As for Carl, he is not running at 100%, but I can see him returning to the slavers' camp in order to keep his mind off things.