Facing Gaara's complete Tailed Beast Transformation, the countermeasure was actually simple: all Naruto had to do was exhaust his chakra or seal it away.
As luck would have it, Naruto had learned sealing jutsu from Jiraiya.
"Who told you to turn into a Tailed Beast? Sit down!"
Before his words had faded, sealing runes appeared in Naruto's palm, writhing and spreading like living things as they climbed through the air toward Gaara's swelling, fully transformed Tailed Beast body.
Gaara rapidly formed hand seals. The chakra for the Feigning Sleep Technique had already surged to his fingertips. Just one final step remained before Shukaku's consciousness could take complete control of this body.
But before he could finish his seals, an unprecedented suppressive force crushed down on him from every direction.
It was a restraint that acted directly on the source of his chakra, forcing even the Tailed Beast's will to a standstill.
"What?"
Gaara's pupils contracted sharply.
He could clearly feel his body shrinking at an alarming speed.
His body, which had been expanding toward Shukaku's complete form dozens of meters tall, seemed to have been seized by an invisible giant hand. His bones, muscles, and Chakra Cloak were compressed layer by layer, producing a teeth-grating creak.
His Sand Armor cracked and re-formed. The Tailed Beast's chakra was forcibly driven back into the Sealing Space, and the enormous tail formed from sand struggled in the air a few times before finally collapsing into a cloud of dust.
Gaara struggled, his consciousness screaming as his fingers desperately tried to complete the final seal of the Feigning Sleep Technique.
But the sealing runes had already crawled over his entire body. Those ancient characters wound around his chakra pathways like chains, dragging him back from the brink of Tailed Beast Transformation into human form,