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Also I went ahead and did Lady Lilith on Easy and was able proc TH14 in 11.5 minutes. Yet another situation where my faith in Treasure Hunter is weakened:
Apologies for the poor crop-job, the TH14 proc and the kill were not close enough to fit on the same screenshot, so I merged the two screenshots (albeit, poorly).
I really wish SE would elaborate on the various levels of Treasure Hunter.