With Sirius
After using Meisaigakure no Jutsu (Chameleon Jutsu) and turning invisible, he wrote a message for the new guy and started his work.
He want to complete this job cleanly without any missteps and entered the tent slowly. Though he is invisible, any sound he makes can be heard normally. Keeping that in mind, he moved.
He entered a large tent with at least 50 thugs sleeping, and weapons lying on the side of the tent, he started performing hand signs.
"Neru Kiri Jutsu,(Sleeping Mist Justu)," said Sirius, releasing a white mist in the tent, as the mist spread across the tent, he held his breath to not get affected by it.
Neru Kiri Jutsu or Sleeping Mist Jutsu is Sirius's own creation. He created this to fight against a large number of enemies in cramped spaces like where they were in.
He created this when he was training with his grandfather Aldoron. He can still remember that day.
Flashback Begin
"Siri, father is calling you." Said Naruto as Sirius was trying his hard to complete the first stage of his water control.
"Wat? Why dos tat lizard cal me?" He asked in annoyance as whenever he goes near Aldoron, he feels so insignificant and kicks the lizart in annoyance, which the big caterpillar laughs off.
"Come on, Siri. Don't be like that. I think he wants to teach you something," said Naruto with a wink. Sirius was elated by that. Everything he knew was taught by his father, Naruto. The bic lizart always sleeps or laughs in his face when he tries to ask something.
He silently walked to the area where he can see a large bark protruding in the forest. He stood there silently, waiting for the lizart to notice and he did immediately.
"Ah, if it isn't the grumpy cub," said Aldoron in his deep voice.
"Wat is it, Gramps. Wat do u want me hre?" Asked Sirius, annoyed. Though he didn't like Aldoron, he respected the Dragon God for his power and his care and love for his father.
"Annoyed as normal I see. It's nothing, I just got a doubt and want you to clarify for me." Said Aldoron, his yellow eyes sparkling in interest. Sirius stayed silent and listened patiently.
"Naruto told me about your practice of fighting one on one. You are creating this 'Battle mode' for that, isn't it?"
"Yes. I want to be stroong, u now!"
"Well, what did you plan when you are fighting a group in a close area, like a cave, building. I don't think you want to obliterate the structure like Naruto does?" Asked Aldoron with a smile. His blonde son has the most destructive tendency Aldoron ever saw. But he also has the smarts to back it up and decide what's the best course of action as well.
Sirius thought about it. That was a sound question. He didn't think about it as he always fought in open areas and what his gramps said about his father is also true.
He would just obliterate the building and construct a new one as he can use both Wood and Earth Dragon Slayer Magics. What can he do? Were some of Sirius's thoughts. Aldoron took note of his thinking and spoke.
"That's why I want to teach you a Jutsu you may call." Said Aldoron. Sirius's interest sparked and he flew up to the snout of the Wood Dragon God, staring straight into his eyes, in excitement.
"I know you are excited, child. Let me tell you how it works," said Aldoron and started his explanation.
"I have seen so many places and magics in my long life, Siri. What I'm going to teach you is a combination of Water and Wind magic. I want to teach it to someone worthy and told Naruto about it.
He rejected my offer to learn, quoting his Light Slayer Magic has enough spells and asked me to teach you. Seeing that you have both Wind and Water magics, I couldn't deny it.
So listen carefully, chibi. The technique is a type of my sleeping pollen that I can make, which allows you to put the targets into sleep even if they inhale the smallest amounts. It is called the Sleeping Mist spell.
But the uniqueness of the spell lies in the mist itself. You can't clear it using any wind magic as the wind magic in the mist repels it. I think you understand, Chibi?" Aldoron asked and Sirius flew around in joy. He let the chibi remark go.
Though he doesn't know much about how his future is going to be, the spell was awesome. He can use it to escape and with his growing speed in air, he can cover large distances before his target wakes up.
If not for escape, he can use it to pull a master level prank on someone. Making the arrangements while they were sleeping. His eyes were sparkling with stars at the mere prospect of how to use it.
"Remember, it can be dispelled if a strong enough Wind spell is used." Said Aldoron, but he knew it was a lost cause as the chibi heard didn't it. With a sigh, he started training him in the spell.
Flashback End