If I play Brynhir Thundersong (which prevents opponents from playing cards this turn) in response to an opponent's spell using Here to Help, what happens to the opponent's spell already on the chain?

Ruling: The opponent's spell will resolve. Brynhir Thundersong does not block already finalized items from resolving.

Sequence:

• Opponent plays a spell
• You react with Here to Help (hidden) and use it to play Brynhir Thundersong
• Brynhir's effect prevents opponents from playing new cards this turn
• The opponent's original spell still resolves