Using two planetary devastations really took quite a bit of chakra from him, and he used Haki too. Using Haki continuously did make him a bit tired, but he still had enough juice to take down another CP agent while using haki. The CP agents were actually in horror when they realized that they had haki. The government, in order to keep everything a secret, couldn't deliver the message that the straw hats had haki.
Their identity was already blown out with CP9, and thus they didn't want to take any risks. So the communication was done in a very discreet manner. This was the reason why Ken wasn't able to hear when the CP agents attacked during the Buster Call.
The CP agent was using his full moonwalk speed to escape, but how could he do so in front of Ken, who had the Stormbreaker? He used the bifrost and confronted the CP agent. He appeared just near him, and they both engaged in a fist and kick fight.
"Rankyaku."
"Ussop hammer... Oh, sorry, wrong character."
Ken used his Mjolnir to take down the CP agent after exchanging some moves, but Haki was always on top, and even the zoan fruit of the crocodile wasn't enough to stop it. He punched and kicked him quite a lot, breaking many of his bones and inflicting lightning in his attacks. After taking him down, he fished out the den den mushi, and thankfully, the connection hadn't been terminated.
The people who had just demanded it a few minutes ago were still on the other side of the connection.
"Yo.. Are you all still there?" Ken asked. Of course, he knew that these people had been listening because the CP agent was narrating a bit of what was going on, including the Conqueror's Haki that was used at the start of the fight.
"Punisher Kenny.. You are the Vice-Captain and the brother of Straw Hat Luffy. I am sure you are not happy with the current circumstances and would love to lead your own crew; why don't you...." One of the voices from the other end was trying to persuade, as he seemed to know that he was talking with Ken on the other side.
"Shut it right there, old man. Smoker, too, tried the same old trick with me. It didn't change me then and won't change me now. I am here to negotiate." Ken said. The old man, who was continuing his persuasion, listened to Ken.
"What do you want to talk to us about?" Another old man asked, as he felt that Ken had done all of this to talk to them.
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"Before you asked us to follow your lead and let our friends be taken away, How about I give you a deal?" Ken asked. "How about you leave Water 7 alone so that everything that has happened here doesn't get to Morgan, who would love to let the world know that the Grand Line's greatest shipbuilding city was being taken down by the government?" I am sure the general public would love to know what you have done to this place."
There was a complete silence on the other side of Den Den Mushi.
"Moshi Moshi. Daijobou deska?" (Hello.. Hello.. Are you alright?")
"Punisher Kenny? Do you even know who you are threatening?"
"The Gorosei. The five men who control this rotten piece of the world The five people who think that your rule will continue since nothing has challenged you in the last 800 years Am I right?"
"You are more intelligent than your grandpa." One of the men said
"You are wrong about Grandpa. He knows what is going on in the world and has turned a blind eye to it. But that was a path he chose alone. And we have chosen ours." Ken replied, and this time he had let go of his calm tone and was serious.
There was another pause in the response from the Gorosei. And then another voice said:
"Water 7 will not be touched from here on out."
"Oh, you crumbled fast. I thought you would speak more about your authority. Remember, you have accepted the deal. And if you are thinking of killing us, then you can try. The videos will be sent to the Revolutionary Army for safekeeping, and if anything happens to us, the videos will be released." Ken said this as he was taking safety measures.
The Gorosei were like rabid dogs. They were used to getting things their way, so if they couldn't hurt Water 7, they might send an admiral after them. The crew wasn't ready to handle an admiral as of yet. Aokiji had let them walk over him, and he wasn't really serious. If he was, it would have been a very tough uphill battle.
"How shall we trust that the revolutionary army won't release the video?" Another old man asked.
"Seriously? Are you ignorant or what? You already know who Luffy's father is, and you are still playing dumb?" Ken asked, quite irritated by their attitude. So much so that he blasted away the den den mushi to smithereens. There was no point in talking more with them.
They had heard about his conditions, and that was enough. If they had good heads on their shoulders, they would make the right decisions.
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"It's more troubling than we anticipated."
"We have not paid enough attention to the straw hat pirates. They are more deadly than we thought."
"That move of the black hole—didn't that guy named Marshall D. Teach eat the devil fruit? How is this Punisher Kenny able to do a more sophisticated move than that?"
"Better question, a member of their own crew apart from the captain has Conqueror's Haki, it means that the captain too has it. The D family really has become a huge problem for us in recent years."
"We need to increase their bounties. We can't exclusively go after them at the moment, but we can send people into a frenzy after them. They will soon reach Sabody; tell all the bounty hunters about their arrival."