I'm still not clear on this, and I think I asked the wrong question before, so I will start over.
The Fury Instinct Barbarian's Raging Resistance resists "physical weapon damage, but not physical damage from other sources (such as unarmed attacks)" (page 87). So what does this resistance actually protect against? Is it only against manufactured, wielded weapons (swords, clubs, arrows), or does it protect against the natural weapons of monsters as well (claws, teeth, stingers)? Does it protect against the damage dealt by mechanical traps (scythe blades, darts, spikes), or do they count as "physical damage from other sources"? Are "unarmed attacks" limited to Fists (page 280) for the purposes of this ability?