A.T. Robertson Commentary Luke 11:14

"And he was casting out a demon [that was] dumb. And it came to pass, when the demon was gone out, the dumb man spake; and the multitudes marvelled." — Luke 11:14 (ASV)

When (του δαιμονιου εξελθοντος). Genitive absolute ana asyndeton between κα εγενετο and ελαλησεν as often in Luke (no οτ or κα).