Raijin was quite familiar with the characters in Naruto.
As he hurtled toward the ground, he did not forget to shout a warning:
"Kakuzu's five masked Earth Grudge Fear forms are hearts of five different attributes that he stole from other people."
"The source of his chakra and the core sustaining his life are all concentrated in those five hearts."
"As long as we destroy those five masked Earth Grudge Fear creatures, Kakuzu's main body will be finished too."
Locked in a tense battle, Kakuzu could no longer contain himself when he heard Raijin's warning.
Bang!
He stamped both feet hard against the ground, launching his main body like a cannonball toward the rapidly descending Raijin.
Kakuzu was indeed no expert in taijutsu, but he knew very well what methods would kill an enemy fastest on the battlefield.
He was anxious, and afraid too.
Raijin's words had laid his secrets completely bare.
Kakuzu could never have imagined that a Jonin he had never met would know him so well.
He even knew his secrets inside out.
If Raijin remained on the battlefield, Kakuzu's secrets would no longer be "secrets" at all.
Kakuzu marked Raijin as a target he had to kill.
Although Raijin's target had been Hidan alone from beginning to end...
Even as he hurtled downward, he had not forgotten to warn everyone and expose Kakuzu's secrets, precisely so his companions would deal with Kakuzu.
That would buy him time to kill the "helpless" Hidan.
Raijin could hardly be blamed for being so calculating.
As the most devoted Naruto fan, Raijin knew all too well how difficult the Immortal Duo were to deal with.
If they waited for Hidan to recover, the five of them would gain nothing against the duo.
From the moment he began making his plan,