Brett-EDH
TVWBB Olympian
Depends on the thickness of his pieces.The lamb is going to cook in less than 10 minutes (likely 7 minutes or less) as a skewer, so no need or time for indirect. Since it is such a fast cook I always cook with lid off.
I breakdown a leg of lamb for kabobs and marinate the meat. I’ll skewer them as I prefer larger chunks so they stay moist.
I’ll sear them over direct flame, lid open and move/rotate the kabobs fairly quickly to build crust.
Then I’ll move them the indirect for a few minutes, lid closed.
Lamb is like a fire starter. You have to be 100% paying attention to it or the cook will run away from you quickly.