補足
If we assume we have a non-merge upgrade, we need to decide whether we want to include anything else aside from another difficulty bomb delay (and whether to keep the name "Shanghai" if we only delay the difficulty bomb, or use another "glacier-themed" name :-) ).
こっちの文では、difficulty bombは、difficulty bomb pushbackとか記述していないので、やはりpushing back the difficulty bomb、difficulty bombを遅延させる必要があるよねって会話になるんじゃない？