I don't think this episode is that bad. Too bad that as far as the anime is concerned, this is the first real interaction between Eclair and Ren. In the LN they already had a bout long before this. There was a history between the two that would have been resolved here.
Also, is nobody going to point at the cursed spear in the room?
For that matter, it's not quite how the cursed spear is portrayed in the LN.
As for what his sin is, I personally think it's rather obvious.
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