What is considered a takedown?

Hi guys, When checking the impact of my runes after a game, I noticed that Chrysalis shows no stats. I suppose it should show me the extra AP/AD I've gained from this rune after achieving the 4 takedowns right? Just like for, for example, Scorch shows that this rune applied 600 damage. I went 2/1/13 and was under the assumption that assists would also apply the takedown? Hoping to find an answer, and decide whether or not to take this rune.
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