Story triggers can really confuse players that are not yet familiar with how all the new items work in a new area (for example, a story trigger can blow up a halcyon the second the player lands on it - and the player might think that it's an item that explodes when touched).

All other triggers are carefully marked - including creatures that trigger things and the newly introduced shuriken triggers.

After all the items are presented, the story trigger is unlocked and can mix things up they way it usually does ;)