You are, of course, welcome to reference and/or borrow theories from my own end-run around that one....

Also, FWIW -- I notice via online TV listings that our mutual local ABC affiliate is re-running that exact Castle two-parter this weekend in their late-night syndicated time slots (the Saturday night ep starting at 12:05am, the Sunday at 11:35 pm). So if you've got access to recording capability, you could get hold of the relevant canon that way.