Forum:Help with Necrovalley

I saw that in the text of Necrovalley, there's not the word negate. But in the Rulings, for example, this:

''Salvage Warrior: You can still activate this effect while Necrovalley is on the field, but you can only Special Summon a Tuner monster from your hand. If you don’t have one, the effect is > negated <.''

Necrovalley negates like Magic Jammer for example or not? Or the word negate it's only a way to explain the effect? ThanksYusei254 (talk • contribs) 15:28, September 28, 2011 (UTC)