Linking your armory might help too.
In 25 man ToGC we use a 3 tank 2 stack rotation (could also do 2 tank 3 stack, but 3 tanks is very beneficial for phase 3 imo, and is just generally easier). You can pretty much tank your first rotation fight, maybe just use shield block to mitigate some damage, but the second time you tank, you should hit shield wall about 1 second before the first impale, and it will last you until the second impale hits so you can shield wall both. This will keep you alive, sometimes I last stand too just to be sure, but with shield wall up I'm fine.
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