According to the dialog, the apparent leader of the victorious side will spare the losers if they give him “Fenwick.” Out of (perhaps misplaced) loyalty many of the captives claim to be Fenwick, defying the demand to turn Fenwick over (h/t to Spartacus). Then some clueless dolt starts complaining about the orientation of his shield’s bars. The whole point is that the solution to his complaint is obvious and his cluelessness undoes the noble sacrifices of his comrades. I found it mildly amusing and blazingly obvious.