Did it twice recently, and I saw a sudden rush at the end of Repair the Portcullis that I've never seen before both times that ended up costing a Platinum. Granted, the first time the portcullis was being defended by an LM that wasn't as ranked as perhaps ideal, but the second time was guarded by a veteran Yellow captain, done these many times with, and we were both stunned.

On a related note, has anyone else had a problem recently with the ballistae during Final Blockade blocking line of sight on taunts? We both had an awful time getting off Threatening Shout/Defiant Challenge/Javelin attacks.