The only way to increase number of Brands on a target right now is the Runebinder notable right next to Ancestral Bond. If you have Runebinder, 4 total Brands, and two enemies, all four Brands will attach themselves to the two enemies. If you don't have Runebinder, two of them would be useless. Brand Recall resets your Brands to be in a circle around where you used Brand Recall, and they immediately determine new targets with increased range afterwards. The purpose of Brand Recall, as far as I can tell right now, is to make clearing maps BALLER, but it's also useful in certain boss fights with lots of adds where you want to make sure you have a couple of Brands on the boss.