"And yourself, ojou-chan," Nagato bid farewell in kind with a slight bow before heading off on his own merry way...

A few minutes after leaving Namimori Middle...

As he was heading for the ritzy hotel so graciously paid for by a 'friend' affiliated with the Vongola Famiglia, Nagato felt his phone start acting up in his pocket. 

"Y'ello," Nagato greeted before getting a rather unintelligible response.
"--------------"
"What."
"-----------------------------------"
"I'm not attacking a school just to start a fight, and I'm sure as hell not [i]bombing[/i] it to take out a not-target."
"------------------------------"
"Old man, I can tell you're drunk. Go home."
"----------------------------------------"
"What the fuck kind of logic is 'having his designated Mist Guardian be the first to antagonize him will allow Vongola XV to channel the power of Tsuna' even!?"
"--------"
"Yes I understand...sort of...but-
"------------"
"...Fine. One explosion. Then I'll proceed with more subtle-yet-visible tactics. Are those conditions ideal?"
"-------"

And with that, Nagato's phone conversation cut off, allowing the young assassin to sigh loudly in relief. "Damn drunkard," he groaned, "on the bright side, I get to put on my robe and wizard hat..."