When an armed man intercepted a bus of Boston-area churchgoers in Egypt Friday, the Rev. Michel Louis of Dorchester insisted that he go in place of the woman the captor tried to seize, a fellow pastor and family friend told worshipers at Mattapan’s Jubilee Christian ChurchSunday. In the end, the captor took both Thompson and the woman, Lissa Alphonse of Everett, as well as the local guide-translator for the group of about two dozen Haitian and Haitian-American churchgoers from Greater Boston.