Although it is not mandatory for an appellant to file a reply brief. However, where a respondents brief raises a point of law not covered in his (appellants) brief, he (appellant) ought to file a reply (brief). Indeed, where he fails to do so (that is, fails to file a reply brief) without an oral reply to the points raised in the respondent’s brief, he may be deemed to have conceded to the points of law or issues so raised in the respondent’s brief.
— C.C. Nweze JSC. Onuwa Kalu v. The State (SC.474/2011, 13 Apr 2017)