When Charm moves an enemy unit into combat at Fortified Position, does the battlefield's 'When I defend' Shield 2 ability resolve before the opponent can play Bullet Time?

Ruling: The 'When I defend' ability from Fortified Position triggers and resolves first, giving Ahri Shield 2 before the opponent can play an action spell like Bullet Time. Ahri would be at 5 might when Bullet Time resolves.

Sequence:

• Charm moves Nocturne into the battlefield, initiating combat
• Fortified Position's 'When I defend' triggers, granting Shield 2 to Ahri
• The chain clears
• Opponent can now play action spells like Bullet Time

Nuances:

• Actions can only be played when no spells/abilities are still pending
• Only Reactions can be played in response to effects on the chain
• If Bullet Time were a Reaction instead of an Action, the interaction would be different