Hey if you are having a problem with this instance, just use shikamaru and kiba or something in a way that will garuntee a knockdown into shikamaru's chase so that you cancel the first hokage. Only the knockdown initiation should be on the first Hokage's line. You need to do damage to the second Hokage. He has to be knocked out first but the first hokage's skill first round is very difficult to work around once it's up and you will lose. After you cancel the first you dont have to worry about him untill you need to cancel him again.

Hope this helps :)