User blog comment:Calvincambridge30/Versus/@comment-3481504-20151023054224/@comment-27006668-20151025142929

The leviathan was not caught off guard. Cass was actually off guard that time. https://m.youtube.com/watch?v=mYZIIJEASCc Skip to 0:45.

Also Cass tried to take Tamiel from behind so if anything Tamiel was off guard.