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Sam pretty much only spends their time in engineering, for starters. They're also one of the crew that you can't spend more than one time slot socializing with. At the moment, you pretty much have to start with the spacer origin to earn enough approval from them to bang Rael as well. You also need to have seen their first event scene on day three, so you'll have to decline meeting with Anwill that day in order to go see Sam instead.

Combos refresh  moves you use after the first in the order. So for example using swirl then shuriken to eliminate two enemies refreshes shuriken for immediate use again.