As to red shifting light photons... If they are all escaping at light speed, then no red shift would be seen. There is no velocity difference. For the sake of this thought I do not think A White Hole has a event horizon. By definition its the opposite of a Black Hole. I can not see one of these things existing for more than a nanosecond. Leading me to questions like; Does a supper massive black hole ever reach a point where it just overcomes its own gravity mass and explodes in a most spectacular energy eruption.?