@ bhu, Arms of Hadar hits every creature in a 2 square burst and unlike some sorcerer powers does not allow you to exclude certain squares of allies from its effects.
@ Inspectre, The western doors took a couple Eldritch Blasts from Tulugaq and look weakened but functional (his blasts put holes through each) so being damaged in this manner makes the break DC easier than the norm. Breaking down a door is a Standard action as opposed to opening it as a minor. You could make a charge against the door and I would give you a plus 1 to the strength check but like other charge attacks it would end your turn (due to the no further actions part of it, unless an AP is spent to take another action).
As for the rope, it is across the pit. If Shandien or Tanthalus jumps across they could pass the rope to you.