Board Thread:Skyrim/@comment-107.5.136.178-20130918210106/@comment-2600:1700:8200:6C20:3561:5997:BB2F:50D0-20180914201223

I can confirm the 'turn off xbox/turn back on' method works. Save just before hitting the tonals, turn off your console, turn back on, reload your save, and hit them in the correct order with whatever missiles (arrows, bolts, magic) you have. Door opened for me.