  We study a generalization of the chaos bound that applies to
out-of-time-ordered correlators between four different operators. We prove this
bound under the same assumptions that apply for the usual chaos bound and
extend it to non-hermitian operators. In a holographic theory, these
correlators are controlled by inelastic scattering in the bulk and we comment
on implications. In particular, for holographic theories the bound together
with the equivalence principle suggests that gravity is the highest spin force,
and the strongest one with that spin.
