Zeth and his men were at the back of the whole group. Zeth and his group couldn't do much with the group of Vuanas since they were at the back of the group. Zeth constantly checked over his shoulder, making sure neither him nor everyone else doesn't get ambushed. Meanwhile Ziltro followed Joth'loel's lead.
"At last we will reveal ourselves to the Jedi. At last we will have revenge." - Darth Maul