Armor is directly linked to resistance... I'll go test myself I guess... But I'm almost positive those resists go up when barkedOk im not giving up quite yet. Take a look at this screenshot:
When you get a ward cast on you, these numbers go up. When you get a lure cast on you these numbers go down. When garanak casts lure of death on you these numbers go down
When you get shield of bark cast on you these numbers stay the same.
Similarly, when you get a ward or lure cast on you your armor is unaffected. When you get bark cast on you your armor goes up.
Make sense?
*edit* the results