Supporting context in the paper: the ankle at 4×10^18 eV is consistent with e+e- pair production in the same proton-CMB interactions, and both features fit the published HiRes light-composition results above 10^18 eV; Berezinsky et al. find local source density changes the above-cutoff power law but not the cutoff energy itself. For the LHC safety question this is what licenses stating the cosmic-ray flux at and above LHC-equivalent energies with confidence.