Idk if this is possible but it makes sense to me.
'); document.write(''); var yuipath = 'clientscript/yui'; var yuicombopath = ''; var remoteyui = false; } else // Load Rest of YUI remotely (where possible) { var yuipath = 'https://ajax.googleapis.com/ajax/libs/yui/2.9.0/build'; var yuicombopath = ''; var remoteyui = true; if (!yuicombopath) { document.write(''); } } var SESSIONURL = "s=afa457d1d2e5d8ce2ed58e1d280bc073&"; var SECURITYTOKEN = "guest"; var IMGDIR_MISC = "warmane/misc"; var IMGDIR_BUTTON = "warmane/buttons"; var vb_disable_ajax = parseInt("0", 10); var SIMPLEVERSION = "422"; var BBURL = "https://forum.warmane.com"; var LOGGEDIN = 0 > 0 ? true : false; var THIS_SCRIPT = "showthread"; var RELPATH = "showthread.php?t=420418&p=3057933"; var PATHS = { forum : "", cms : "", blog : "" }; var AJAXBASEURL = "https://forum.warmane.com/"; var CoTTooltips = { rename: true, icons: false, iconsize: 15, qualitycolor: true, overridecolor: { spells: '#839309', items: '', npcs: '#fff', objects: '#fff', quests: '#ffb100', achievements: '#fff' } }; // -->
Im guessing because you cant complete it without a key, which needs a quest. If you're RDFing, you're likely not going to have the key so you can't actually finish the dungeon.
It's the same thinking with Scarlet Monastery's Armory (which needs the scarlet key to open Herod's door)
It's actually different from scarlet monastery though because you can do the quest for the key while doing the BRD run; the key for SM Armory/Cath is in an entirely different instance.
You get the key by dying and talking to the npc in the center rock hanging in Blackrock Mountain, then killing 1 boss. Also I'm fairly sure rogues / blacksmiths can open the doorway. You should ask at the start of the instance if anyone has the means to open it, and if not send someone to go start the quest.