Manson is an experienced powerhouse in the Great Universe Sea and ranks third on the assassin list. It can be said that his reputation in the Great Universe Sea is even greater than that of Heron, and of course, his strength surpasses Heron's.
Manson knows Heron not just because of their mutual fame, but because they had dealings many years ago. Manson once assassinated a high-ranking official of the Sea Clan and was hunted down by Heron and his team. Naturally, the result ended with Manson successfully escaping, and Heron's mission failing.
So as soon as Manson appeared, he mocked Heron with his words. Seeing him, Heron's expression was not very pleasant either.
Manson provoked Berg because he sensed that Berg had the strongest aura among the Guding Team. Seeing Heron's current state, he assumed it was due to a battle with Berg. He believed that as long as he suppressed the strongest Berg and then took away Radcliff, no one would dare to object.