If you want to go around, you can certainly avoid the patrol. It's up to you whether you encounter them or not.
Backtracking a little, you swing wide, following a depression and get beyond their line of sight.
Your freed messenger says quietly, "I don't know what good they could be doing on these missions. The thralls are effectively simpletons, they can't send reports, unless there is a free-mind collaborator with them. They only follow orders."