Forum:Dragon spirit of white (Quick effect)

Ok.... I need clarification on this.. I keep hearing contradicting things on this topic (even with judges) To my understanding quick effects ("this effect can be activated on either players turn") can be activated pretty much on any phase at any point of the duel EXCEPT for the damage step unless it directly impacts the card/cards involved attack and defense, because it states so in the rule book. Sooo that means DSOW cannot activate his tributing effect on the damage step right???