So yeah, this has been bothering me for a bit, now. Pack Tactics provides a bonus to damage due to Swarm, but Uncontrolled Rage hits allies adjacent to a target for 50% damage. What this means, basically, is that friendlies contributing to swarm bonus are effectively committing suicide in the process - not just by being there, but also by increasing the Warrior's damage to themselves. This strikes me as more than a little backward, and as something that should not be - specifically, the fact I have to waste a level point on a trait irrelevant to a solo fighter (with UR), or ignore a powerful trait of the Warrior tree in order to build a team player.

Thus I would suggest, either 1) rearranging the warrior tree so PT is not a pre-requisite for UR, 2) removing UR's splash damage effect to friendlies, or 3) adding a trait to the Warrior and/or Defender trees that make them immune to friendly splash damage, so that they can add Swarm damage to a Warrior's attack without getting hurt for it.