Forum:Respond to change on field question

Was reading over some old deck analysises;

"When Patterson uses Scrapstorm to destroy his Scrap Goblin or Scrap Beast and activate its effect, he can choose whether to make the Scrap effect Chain Link 1 and Granel’s effect Chain Link 2, or Granel’s effect Chain Link 1 and the Scrap effect Chain Link 2. By making Granel’s effect Chain Link 1, he can prevent an opponent from using Royal Oppression or Solemn Warning to negate its Summon. By making Granel’s effect that Summons it to the field Chain Link 2, Patterson is able to prevent his opponent from flipping Torrential Tribute to destroy it when it’s Summoned."


 * Why?(for bit in bold), as I though Torrential could be used after say... Shrink due to it being a change in the field?
 * Ref to verify i used search function Forum:Monarchs and bottomless trap hole, Forum:Morphtronic Celfon, and the third one was me replying to someone <,<
 * Thanks in advance
 * - Resk ( ✩ ) 12:42, July 22, 2011 (UTC)