Going back to when Six Desires was suppressing Jiraiya, Six Desires had also unleashed divine power, and his carried a dark will. Jiraiya therefore dared not clash with him head-on, afraid that the dark will within his power would affect him. He fought cautiously, holding himself back, with little choice in the matter.
Knowing that his own power was stronger yet being unable to confront his opponent directly made the battle with Six Desires deeply frustrating for Jiraiya. The helplessness of having no other choice left him increasingly agitated.
That agitation gave Six Desires time to observe the other battles while fighting Jiraiya. He was astonished to discover that Nagato could hold his own against Naruto and Sasuke together, but their strength surprised him even more. Just three months ago, Naruto had been unable to withstand even one of his attacks, yet now he could fight Nagato on equal terms. Six Desires was surprised, but his heart also filled with delight.
Six Desires thought, Naruto's strength has grown so much. It seems he doesn't even need to absorb the power of that Chakra Crystal anymore. In that case...
After gathering an enormous surge of divine-power chakra, Six Desires forced Jiraiya back. At the same time, he used his Spatial Ability to appear instantly before Hinata, who was fully focused on fighting Konan. In the moment she froze in surprise, he plunged the kunai in his hand into her chest.
The moment Six Desires suddenly opened a Spatial Gate, Jiraiya had a bad feeling. Oh no, he thought. Then he saw Six Desires appear before Hinata. He desperately wanted to stop him, but it was already too late. He could only watch helplessly as the kunai pierced her chest.
Naruto, who had just been sent flying, happened to see Liu Yu