User blog comment:MisterRandom2/Can an Angel Blade kill a demon?/@comment-87.112.38.134-20120902190524/@comment-1509826-20120902192845

If so, why didn't Castiel just draw his angel blade and stab Alastair when it turned out the smiting didn't work? From his look its clear he didn't know that any demon was immune to angelic smiting, so it stands to reason, that other angels wouldn't to, (except of course head office, but they don't come down, unless they need to, so I don't think they would care.)