why did Nunu have such a High winrate in patch 6.9?

It was fairly Low before and then suddenly spiked up a good 4-5% (during patch 6.9) before reducing in the same amount next patch. So why the Sudden increase of winrate and also perhaps the Sudden decrease.

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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