The cipher B-2 wouldn't even be a shift; it would simply be A=1, B=2, ... Z=26, so that's the first thing that bothered me. ... This scheme involves choosing a keyword and encrypting as follows.

The Double Transposition Cipher ... Next, select and number a second keyword, and write this intermediate ciphertext under it in rows: 2 7 1 8 9 5 4 6 3 C O A S T L I ...