A BLM in above average PDT(basic augments, no Defending Ring) will, without Phalanx, be hovering around ~100/hit. Assuming you're pulling ~15 mobs/pull(depends on camp, can likely go higher), that's 1500 damage(or 750 MP) for one attack around out of every mob, which doesn't include the inevitable few hits you're going to sustain on the actual pull, the likelihood of several things getting off more than one hit, the chance of double attacks, crits, or the occasional lag. Now consider the fact that you're not going to be casting sleep in PDT, and that estimate rises tremendously.