Can an opponent play reactions or spells in response to Brynhir Thundersong's trigger ability during my turn?

Ruling: Opponents can play reactions to Brynhir's on-play trigger, but after that trigger resolves, they cannot play reactions or spells during your turn.

Sequence:

• Brynhir Thundersong is played
• Opponent can respond to the on-play trigger with reactions
• After the trigger resolves, opponent cannot play reactions or spells