I think how to handle this situation and judgement is important here.After initial opening of South ,North knows they have the majority of HCP is in their partnership and they are "the attackers".There is no need to rush ,because opps need to show their hands . After East 3♠ bid and West pass,North needs to take the action for good news.North has a near opening HCP and count 23 or more HCP for their side, plus a very good general T/O DBL opportunity . They will bid accordingly then after even if they have an aggrement or not. Noth South can not let opps play without pen.DBL after North DBL 3♠.Passes are forcing and/or they bid their game or keep bid on. Other room's N-S bidding is very instructive .There is no rush, Mr.Garozzo and Mr.Cayne wait opps resume their bidding and Mr.Garozzo takes the initiative , simple and beautiful. You may want to read this article http://www.clairebridge.com/doc_pedagogiques/camp_en_attaque.pdf .It is in French but many would understand.