However Sisera fled away on his feet to the tent of Jael the wife of Heber the Kenite; for there was peace between Jabin the king of Hazor and the house of Heber the Kenite.
We are not given any account of how Barak must have reacted to what Jael showed him.  In ancient times, it was considered the ultimate dishonor for a brave warrior to be slain by a WOMAN.  Barak must have recalled the words of Deborah that prophesied the very thing that he encountered in the tent of Heber the Kenite.