If a Hyūga manages to block one of Sakura's or Tsunades chakra points or a series of chakra points, they can easily unblocked them in a matter seconds, BY RELEASING THE YIN SEAL.
DATABOOK EXPLANATION: Yin Seal: Release - After focusing and storing an amount of chakra over a period of time in the Strength of a Hundred Seal on the user's forehead, the user can release any amount of chakra with this technique by dispersing the seal and forcefully pumping the stored chakra back into the user's body. After the stored chakra from the Strength of a Hundred Seal is used, if there is any leftover chakra, the user may use it to re-form the seal.
MAIN POINT: FORCEFULLY PUMPING THE STORED CHAKRA BACK INTO THE USERS BODY.
Again, when the seal is released it FORCEFULLY pumps the chakra in the seal through out the body.
Which will reopen any chakra point that has been blocked and no the Yin Seal its self cannot be blocked by hitting the user's forehead due to it being a SEAL and not a CHAKRA POINT.
DATABOOK EXPLANATION: Yin Seal: Release - After focusing and storing an amount of chakra over a period of time in the Strength of a Hundred Seal on the user's forehead, the user can release any amount of chakra with this technique by dispersing the seal and forcefully pumping the stored chakra back into the user's body. After the stored chakra from the Strength of a Hundred Seal is used, if there is any leftover chakra, the user may use it to re-form the seal.
MAIN POINT: FORCEFULLY PUMPING THE STORED CHAKRA BACK INTO THE USERS BODY.
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Again, when the seal is released it FORCEFULLY pumps the chakra in the seal through out the body.
Which will reopen any chakra point that has been blocked and no the Yin Seal its self cannot be blocked by hitting the user's forehead due to it being a SEAL and not a CHAKRA POINT.