With some distance now between their 2017 debut, Lost System has honed their sound beyond mere impetus with Left Behind, doubling-down with measured swaths of suitably icy disenchantment, all tersely arranged to stride alongside the lauded heavies of the international post-punk cognoscenti.  Goth-hued moments like “No Regrets” almost ache with phase and throb.  “Discipline” flips toward industrial-informed synth-punk derangement, giving way to the closure of the title track, an epic semi-suite that begins as dour slow-dance that eventually speeds through the sleet.  Discarded at the edge of the world --- Left Behind.