The Imperial Class deck "Armored Onslaught" contains the card "Reactive Armor". It has this text:
Verena's "Create Opening" has this text:
So, assume Verena attacks an adjacent unit and that unit has the Reactive Armor. The Imperial player rolls an [Evade] result.
Verena decides to use "Create Opening" to apply -1 [Evade]. Does the Imperial Player still receive the +2 Block?
From the Rules Reference, there are 2 entries for timing-specific conflicts:
Confli