So everyone is aware, the extra attack generated by sweeping is optional. So, if your Warlord and one opposing creature are in the same zone, he can use the full action attack without clubbing himself in the head. I have spoken to Bryan about this and the original text did not imply that the attack had to be made, but it also did not imply that the attack was optional either. We will be fixing this on future printings. Evidentally the text in the comprehensive codex was unintentionally more specific and that will be repaired as well. Thank you all for bringing this question to our attention. If you have further questions on this subject feel free to contact me. Thanks!