Oh, I see. But the usual pattern of block-downvoting has been much less abrupt than that. (In my case it was, I think, somewhere in the range of 1-10 downvotes per day while it was happening.)

I suppose it's possible that Eugine is trying to do as much damage as he can before his ability to downvote finally goes away, but that seems obviously pointless (it's just asking to have all his votes reversed) so I'd guess it's someone else. This seems like a particularly stupid time to be engaging in obnoxious downvoting patterns, though -- much more likely to get caught, probably more likely to get slapped down hard for it.