An undesignated pair from which [one] bird flew [away, out] to the [open] air [of the world], or it flew to among [bird-offerings] which must be left to die, or if one of them died, he must take a partner for the second [bird].  [If] it flew to among others which are fit for offering, it is unfit, and it renders unfit one [bird] corresponding to itself; for a bird which flies [out of its pair and into other pairs] is unfit, and it renders unfit one [bird] corresponding to itself.