The only reason we wiped is because of your heroic effort to stand on the Templar as it died! :p

At 30 seconds in the clip, you fall off the platform trying to prevent the Templar from teleporting. You jump back up, but you totally don't have to. If you just stand right next to the platform, you are 99.9% safe from any damage (save for a stray Harpy that could show up), and you block the teleport. You don't need the relic holder there for anything, since the Templar has absolutely no way to hit you (if anything, having people there makes you vulnerable to splash damage).

Pro-Tip. ;)

For some reason, only one oracle spawned, which threw me off, Breitzen's Defender class was still empty, CougRon just fell, and those were the only Titans we had. It was rough. And I got killed by a Minotaur while trying to block the teleport, which is why we wiped. But miraculously, we pulled it off. But since someone (cough) died on the way down, the chest despawned, and we fought for naught. But hey, it's just shards.

(Shouldn't that have been the exotic chest, like Golgoroth's Cellar?)
Here's the full encounter, from my point of view:

http://xboxdvr.com/gamer/Morpheus414/video/20085607