  We carefully study the spectrum of open strings localized at the
intersections of D6-branes and identify the lowest massive 'twisted' states and
their vertex operators, paying particular attention to the signs of the
intersection angles. We argue that the masses of the lightest states scale as
M^2 ~ \theta M^2_s and can thus be parametrically smaller than the string
scale. Relying on previous analyses, we compute scattering amplitudes of
massless 'twisted' open strings and study their factorization, confirming the
presence of the light massive states as sub-dominant poles in one of the
channels.
