Ni 138--clarification on arguments

Dear Sir,

There were few things that got over looked in trial court in an NI 138 case and now it is at the arugments stage at the sessions court, without adding any external evidence can we inlcude and further our arguments from that perspective, will the court allow this if so under what provision, as I doubt the counsel for the oppossition will definitely object saying this was not brought out during trial, this is a very important evidence and can turn the case around, plz advice.