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There's a third issue that affects both of them, something so serious that both of them need to set aside their own agendas and team up to deal with it. This gives them a chance to know each other...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/43834 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/43834 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
There's a third issue that affects both of them, something so serious that both of them need to set aside their own agendas and team up to deal with it. This gives them a chance to know each other better - each learns how the other thinks, and gets a better understanding of the other's motivations. Over time they may even become more sympathetic to each other's positions. They don't need to become good friends (although you can do this, if you want), but allies. You just need to reduce the tension between them enough so they can later work on each other's problems without _too_ much conflict.