The game is a conversation amongst the participants about the crew's exploits.
The GM describes a situation, the players describe what their characters do & say, and the GM describes how the world reacts. This is a collaborative conversation – no one person is "in charge" of the story.
Sometimes, someone will describe something that doesn't have an obvious outcome, or changes the current situation in some important way. Maybe a PC attempts to hack a security firewall, or the GM introduces a heavily-armored bruiser to block the crew's path.
That's when the rules come in:
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