It has become an evening ritual. Protesters arrive in the hundreds to Barcelona’s streets. Faces covered, they carve rocks out of broken sidewalks which are then hurled during the nightly running battles with police. Since Spain’s Supreme Court sentenced 12 leaders of Catalan political leaders to long jail terms for sedition for holding a 2017 referendum calling for the region’s independence protests have rocked the capital. While the vast majority have been non-violent, groups of youths have taken it upon themselves to set fire to the streets.