If I get him right he suggests you to do some kind of hack\trick.
I suggest you to to as required for the first run.
This level is artificially hard.
It is more about game mechanics than programming
All you need to know for beat this level
- archers can place some hits on shamans before they cast fling\fear on them.
- soldiers and archers can attack while in the air.
- paladin shield mitigates spells