When Icathian Rain resolves, is all damage dealt simultaneously or are there reaction steps between each ping trigger?

Ruling: When Icathian Rain resolves, it creates 6 reflexive triggers that deal 2 damage each. These triggers resolve one by one, not simultaneously, and players can react after each trigger resolves.

Sequence:

• Icathian Rain resolves and puts 6 reflexive triggers on the chain
• You pick targets and order for all 6 triggers simultaneously
• Each trigger resolves one by one
• After each trigger resolution, players can react

Nuances:

• The targeting and ordering happens all at once, but the actual damage resolution is sequential