The sound of this being in flight,
given the wing membrane has the tensile strength of interleaved silk,
and the attached bone has the support of natural occurring nano-tubes,
and the spikes enhance aerodynamically efficiency without self impalement,
and the pupil-less eyes act as protective membranes during high velocity,
and the outstretched horns aid in balance and species communication,
then I conclude this being in flight would cause a distinct fapping sound.