An old adage among paladins is to never use Blessing of Protection on oneself if one can use Divine Shield instead. It is divine wisdom indeed, and I paid the price for ignoring it.
Scenario: Warrior and I, against a rogue and a paladin in the Circle of Blood. Rogue on me, warrior on their paladin, handing out the pain. For some strange reason, I decide to use Blessing of Protection instead of Divine Shield, a retarded response probably triggered by the huge barrage of melee hits.
Result: Rogue instantly blinds me. Good rogue, I must say. I use my PvP trinket to get out of it, but by then, I have lost valuable time to heal myself. Not to mention that the wound poison stack stayed on me. I fell, followed soon after by the warrior, as the paladin pumps out heal after another while the rogue does his stunlocking.
15 rating down the drain. I could've kicked myself.
Still, overall, we did quite well, going 7-3 again, to reach a rating of 1622.