Twice now this map has totally froze me out of the game when playing clash, first time I put it down to one of those things, graphics error or something, now I'm not too sure as on both occasions it has been the same map and in exactly the same place just before the stairs up to control point A, as you come in from the outside. The only way to unfreeze is to reboot xbox, this is not coincidence, it has never happened before on any other game or in any other area of Destiny, but to be the same map and in the exact same place when playing Clash it's narrowed down to being a Bungie issue for sure.
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I had the same issue yesterday (29/8/2015), while on Cauldron map, in the location you mentioned. Unable to move the character. The PS4 controller would not respond to any button press, yet once the game disc was ejected, the console operated normally. Indicating a game issue, not the console.