March 23, 2009
The Nightmasks are a vigilante group that patrol the Greenwharves. Originally they focused on keeping other Sunlanders safe from normal humans, but in recent years they have branched out to punishing those they see as a danger to the Sunlander way of life -- a remarkably broad category.
The thing Travis is holding in the final panel is officially referred to as a Sonic Debalance Baton (SDB) and classified as a 'warning weapon' which emits a short-range sonic pulse that interferes with the inner ear. Unnofficially, it's called a puke stick, and its 'warning' boils down to 'unless you want to be grovelling on the ground losing your other two meals, don't do that again.' As warnings go, it's fairly effective.