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Dreadwing is equipped with Forcefield, Emergency Defense Field, and Backup Bag takes 5 or more attack damage, what happens? I think that the Forcefield would try to scrap first (reducing the damage to 4) and the Back-Up Bag would save it... then the Emergency Defense Field would make Dreadwing take no damage and scrap. Is that right?

That is correct!
Source: Wizards of the Coast (2019-10-11)    【Link to Ruling】
Tags: Force Field, Force Field, Emergency Defense Field