I just did this strike in the Heroic rotation, and it looks like one of the good people at Bungie has tweaked the end boss fight a little. I had gotten used to Taniks spawning on the raised center platform in the final room and then retreating to the rear left corner. This time he chased one of us around the room and wasn't as easy to kill. Interesting,
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Interesting. Maybe they bumped up his AI.