[williestargell]

Calm the second row of mobs and one mob in the first row. Time it so the roamer in the center is roaming away. Tag the nearest un-calmed mob and he will come solo. Pet him. Do the calm thing again and pull from the nearest row again. Now you've got a pet and a mob for him to fight. Keep them out of line of sight of the roamer or he'll agro when he roams close.

Keep doing this pulling one at a time until it's clear. You should be able to clear the whole entrance hall before any start repopping, but if you're killing slower just ignore the two flanking the steps at the far end.