Involved in DNA double-strand break (DSB) repair (By similarity). Acts probably with NurA to stimulate resection of the 5' strand and produce the long 3' single-strand that is required for RadA loading (By similarity). Exhibits DNA-dependent ATPase activity and DNA helicase activity (By similarity). ATP + H2O = ADP + H(+) + phosphate Belongs to the HerA family.