One's Own Life Reincarnation truly consumed far too much chakra, proportionate to the immense risk of this forbidden technique.
The amount of chakra was closely tied to the life force contained within a ninja's body. Elderly Chiyo was no longer the hot-tempered female ninja she had been in her youth, one who had struck fear into others even on the battlefield.
After the group had traveled all the way to the Land of Birds and rushed here without stopping, they were utterly exhausted. Even Sasuke Uchiha and the others, young and in their prime, were struggling to endure it, let alone the aged Chiyo.
"Will this really work if it continues like this?"
Any ninja with even slightly exceptional sensory abilities—such as Sasuke Uchiha and Hatake Kakashi, who possessed the Sharingan; Hinata Hyuga, who possessed the Byakugan; or even Shino Aburame and Kiba Inuzuka—could sense that there was something abnormal about the technique Chiyo was using.
"Is this really a medical ninjutsu?"
Sakura turned to Karin with a puzzled look. When it came to medical ninjutsu, her friend was still better than she was.
"It does resemble one, but..."
Karin observed with her extraordinary senses for quite a while before answering.
"Although medical ninjutsu that saves lives consumes a great deal of chakra, having chakra surge out without restraint like this technique does is far too dangerous."
A person's chakra reserves reflected their life force. Losing too much of it would inevitably drain their own vitality.
At Chiyo's age, if this continued, she likely would not be able to hold on much longer.
The Konoha ninja who knew a little of the inside story all kept silent.
If Gaara could not be saved and Chiyo instead lost her life here, it would be far too tragic.
But this was Sunagakure's