Kizaru dancing just indicates his close relation with other characters. It is not over. On contrary, it makes Kizaru more complex given now he has a mission to kill the character he was close enough to dance.
I understand what you say, but this brings up a trait of Kizaru's personality based on everything we've seen that is bad, he TODAY didn't care in the slightest about Nika's presence in front of him, and used the pacifists as a weapon , apart from the fact that he continues on the mission to kill Vegapunk. The only time he offered a second way, that is,-> it's not even salvation <-, but he offered a second way, was when he fought Sentomaru.
From what we can conclude is that he is the type of person whose friendship only lasts until the moment it starts to interfere with his professional life, at that moment he doesn't back down from cutting them off, no matter how much he cares a little.