Moroni 9:10

and after that they had done this thing, they did murder them in a most cruel manner, torturing their bodies even unto death; and after that they have done this, they devour their flesh like unto wild beasts, because of the hardness of their hearts; and they do it for a token of bravery.

After they did this, they killed them in a very cruel way. They hurt their bodies until they died. After they did this, they ate their flesh like wild animals. Their hearts were so hard. They did it to show how brave they were.

they murdered them in the cruelest ways, torturing their bodies to death. And after that, they ate their flesh like wild animals—their hearts are that hard. They do it as some kind of twisted badge of courage.