Thread:CSaPForumWall ~ VS Threads/@comment-31835132-20190406192606/@comment-31835132-20190407104925

Yes, if a soul gem is at least 100 meters away from a magical girl's body, she instantly dies. However, if the soul gem is brought back to the magical girl, she will return to life. In that scene Sayaka was dead, but she came back to life when Homura gave her the soul gem back.