www.businessinsider.com/spacex-nasa-crew-dragon...
Koenigsmann said the affected part of the heat shield was close to "tensions ties" that connect the Crew Dragon to its large cylindrical trunk. (The trunk helps propel the spacecraft in orbit but is thrown away before the spaceship begins reentry.) One of four areas surrounding those tension ties got deeply worn away by searing-hot plasma as Behnken and Hurley returned to Earth.