That was showing events for Tsukuyomi, not the crows mate.
@ Bold - The title of the passage: "The logic of change in chakra nature": Now lets name all the chakra natures:
Fire
Water
Lightning
Wind
Earth
Those are the physical portions of chakra eg; Yang
Genjutsu
That is the spiritual portion of chakra eg; Yin.
Though discussing Yang, it's obvious Yin, as well any chakra vs chakra scenario is included due to the quote: "Because the loser is also hit with his own
JUTSU"
He felt the overpowering of the technique, hence why he held onto his eye.
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Rasengan is a prime example that chakra portions can be transferred in odd amounts:
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Hence the many different variations of the basic Rasengan (excluding chakra nature transformation).