Why are the captain and Joel Sargent surprised to find Caleb and Marguerite still on board the ship after the storm? What does Joel say about Marguerite?

The captain and Joel Sargent are surprised to find Caleb and Marguerite still on board the ship after the storm because they were in a dangerous position and should have been washed overboard. Joel Sargent tells the captain that Marguerite has grit for going out there and helping Caleb without question.