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This is related to: What is the difference when a jutsu is performed by weaving only some of it's seals and when performed by weaving all of them?

According to the answer, head-weaving is a technique used to manipulate chakra to perform the Jutsu. Some users require more hand seals to perform the Jutsu whereas other do not require as many due to their chakra control.

In Naruto Shippuden, Episode 374

We see Kakashi and Obito having their battle in the realm where their Mangekyou Sharingan takes them. At roughly 8:30, Kakashi and Obito are in close quarters and Obito takes Kakashi's hand to perform the hand-seals for FireBall Justu.

How does the charka manipulation through hand-seals work when performing them with another participant?

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As said in the linked post, the hand signs are for the manifesting chakra, while weaving hand signs. More the shinobi's skill and chakra control increases, less the hand signs he needs to use. While techniques may require a number of hand seals to work, a skilled ninja can use less or even one to perform the same technique.

In the whole series, we've seen shinobi using hand signs with two hands, one hand and even no hand signs, which requires a very precise control of chakra. As mentioned in this post, at various instances shinobi of great skill like Itachi, Minato, Sasuke or Naruto used even one hand signs or no hand signs.

But When using hand signs with another participant, they both need their chakra to be in perfect sync with each other and should have a great control over it. That's why Naruto and Sasuke could accomplish some jutsu.

Also, there were instances, like in Obito Uchiha using Kakashi Hatake's hand for the Fire Release: Great Fireball Technique or Anko Mitarashi using Orochimaru's hand for the Twin Snakes Mutual Death Technique. For these instances, a shinobi needs to have a great amount of chakra, which he forces to make it flow into other participant's body and gains control of other's chakra (momentarily) to get his jutsu done.

Hope this answers your doubt. :)

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As we don't see much of these two-man hand seals, nobody really uses them. The only practical time someone would use it is when someone needs to perform a jutsu that requires a lot of chakra. You do this by weaving hand signs like a normal person would. The only thing different is that the two people would have to merge and cooperate their chakras into that of one person. This is very complicated and rarely used, and the only time I thought two-person hand seals were necessary was when Naruto and Sasuke were doing the Reverse Tsukiyomi jutsu. It required an enormous amount of chakra, and only two people with a lot of chakra, like Naruto and Sasuke could accomplish it.

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