When an item on the chain resolves, can players play reactions before the next item resolves, and who gets priority?

Ruling: When an item on the chain resolves, priority is given to the controller of the next item on the chain (if the chain isn't empty). This allows players to play reactions between chain resolutions.

Sequence:

• Item 3 resolves (A's reaction)
• Priority goes to the controller of item 2 (B)
• A also has a chance to play a reaction before item 2 resolves
• If A plays a reaction, it's added to the chain and A has priority first
• B can then react to A's new reaction
• This continues until both players pass
• Item 2 then resolves

Nuances:

• The controller of the next item on the chain gets priority first after an item resolves
• When a new item is added to the chain, the player who added it gets priority first