Because the Lannisters already had Sansa under their control and didn’t need LF for that. Lysa was out of pocket with the whole of the Vale under her command, so they were willing to let LF do his thing in order to bring her into the fold.
Just a backup in advance of the detumblring
Because the Lannisters already had Sansa under their control and didn’t need LF for that. Lysa was out of pocket with the whole of the Vale under her command, so they were willing to let LF do his thing in order to bring her into the fold.