Can Retreat (a reaction card) be played in response to an opponent ending their turn, before End of Turn effects resolve?

Ruling: No, Retreat cannot be played when an opponent ends their turn. Priority does not pass as phases and turns end unless something creates a chain.

Nuances:

• Certain cards like Sona or Annie's Legend (Dark Child) create chains at the end of a player's turn that can be reacted to
• Simply ending a turn does not create a chain that allows reactions