New Defender's Study Bible Notes
28:12 the woman saw Samuel. The “witch of En-dor” undoubtedly expected to call up her own “familiar spirit,” who could feign a message from Samuel. God, however, actually allowed Samuel’s own spirit to return to deliver one final message of condemnation to rebellious Saul. This is why the woman screamed out in shock and fear; her channeling had never before communicated with the departed spirits of real humans.
28:19 be with me. This incursion of Saul into the forbidden arts was the last straw and was the reason why God let him be slain the next day (I Chronicles 10:13-14).