Working together you still can't seem to budge it past that... there when you guys finally stop pushing it, you hear a small clink coming from about midway up the door...
The chain is too tight to lift from the outside and Dorgath dulls a knife after about half a minute of trying to cut it... it takes him roughly 10 minutes to resharpen it.
Helata chants for a moment, and motions, focusing on the crack between the door and the door frame... and there seems to be a soft puff followed by some dust.
... then you hear some monkey sounds behind the door...