The enabling assumption of the whole black-hole-risk discussion; the paper itself calls it “a fascinating … but also a somewhat unlikely possibility”. Current lower bounds on M_D at writing were ~1 TeV. Black-hole formation threshold: the paper conservatively allows M_min = 3 M_D (entropy ~ 24 at M = 5 M_D is the usual semiclassicality criterion). Without this hypothesis no LHC black holes exist and the risk question is moot.