Why is the word ceremony used in Mosiah 19:24?

Mosiah 19:23-24

 23 And the people told the men of Gideon that they had slain the king, and his priests had fled from them farther into the wilderness.

  24 And it came to pass that after they had ended the ceremony, that they returned to the land of Nephi, rejoicing, because their wives and their children were not slain; and they told Gideon what they had done to the king.

I think the ceremony has to do with the death of the king and they are obligated to do some ceremony as quickly as possible, thus they don't wait until they return to the land of Nephi.

I agree with this site:

The fact that "the ceremony" is mentioned only in passing and is not described suggests that it was such a normal thing that there was no need to explain it. I believe that these Nephites, who had just slain their king and perhaps others in battle, underwent the purification required under the law of Moses for those who had touched dead bodies.

This site had some interesting insights:

the conversation itself is a ceremony or that it involved some kind of cere­monial aspect in recounting the execution of King Noah.

I don't think so.  The article also suggested that,

a word might have been miscopied or misheard as cere­mony

They suggest the word was sermon, misspelled as cermon, and then fixed incorrectly to be ceremony.  I don't think so.  I think there really was a ceremony and Mormon was just in a hurry to finish the text and fit it all in and he figured it was obvious so he didn't go into more details.

Someone Else's Blog Why is the word ceremony used in Mosiah 19:24?