The person who seemed like a castanet appears to be very flexible. Their flexibility is probably such that they can respond to any unreasonable demand, regardless of their own circumstances. They might be able to easily overcome sudden events as well. It seems they have an optimistic side. Their lack of attachment allows them to easily fit in with people and places. Perhaps it's because of their optimistic and non-attached nature that they can adapt to the situation while changing themselves. It might be natural for this type of person to take actions according to the situation.