Can you respond to Fiora's trigger with Gust when she attacks/defends alongside Yi, and does it work differently if she's defending?

Ruling: Fiora's "When I attack/defend" ability creates a trigger that can be responded to with Reaction spells like Gust. However, if Fiora is defending with Yi, Gust would not work on her alone because Yi's +2 Might ability applies first through layers and dependency, making her 5 Might (above Gust's threshold).

Sequence:

• Yi's +2 Might ability applies first (layers and dependency)
• Fiora's "When I attack/defend" trigger goes on the stack
• You can respond to Fiora's trigger with Reaction spells

Nuances:

• Assault and Shield are not triggers that can be responded to
• Yi's ability is not triggerable
• Gust specifically won't work on Fiora when she's with Yi because the Might buff applies before you can respond, putting her at 5 Might