Anytime a hardcore band goes a few years without touring or releasing anything, I generally assume that the band quietly broke up. Anytime one of those bands suddenly rumbles back to life, it’s a great little surprise. That’s what’s just happened with Firewalker, a Boston band that plays a feverish, elemental version of hardcore punk. Before yesterday, Firewalker hadn’t released anything since the short, brutal 2019 EP The Roll Call. Today, though, they’re back with two new songs and a cover.