That or sell them back to whoever they had escaped from.
And 17th century New England colonists---folks I can trace a direct line back to---had plenty of slaves. The colonists had both African and Native American slaves.
I read these things in the Pulitzer Prize finalist book New England Bound--Slavery and Colonization in Early America.
This is all how some individuals roll and why I don't romanticize or inherently trust any group of folks--such as my own Colonial New England kin---or hold any experience of oppression---such as suffered by 17th century Native Americans--- as inherently offering either wisdom or kindness.
Folks have to make the individual call--outside of group identity--to be decent people.