  We argue that, as a consequence of the graviton's spin-2, its bremsstrahlung
in trans-planckian-energy ($E\gg M_P$) gravitational scattering at small
deflection angle can be nicely expressed in terms of helicity-transformation
phases and their transfer within the scattering process. The resulting spectrum
exhibits deeply sub-planckian characteristic energies of order $M_P^2/E \ll
M_P$ (reminiscent of Hawking radiation), a suppressed fragmentation region, and
a reduced rapidity plateau, in broad agreement with recent classical estimates.
