How does Warwick's ability work, specifically when does it trigger and resolve?

Ruling: When Warwick becomes an attacker for the first time (typically when moved to an occupied battlefield with a standard move), his triggered ability goes on the chain as part of the initial chain of combat. When his ability resolves, it kills all enemy units at the battlefield that have damage marked on them.

Sequence:

• Warwick is moved to an occupied battlefield and immediately becomes an attacker
• Warwick's triggered ability is added to the initial chain (along with any other attack/defend triggers)
• Players can respond with reaction spells/abilities only (not actions, as actions can only be played when there is no chain)
• When both players pass in a row, the newest item on the chain resolves
• This process repeats until all items on the chain resolve
• Once the initial chain fully resolves, the attacker gets focus and can play actions or pass
• Warwick's ability kills all damaged enemy units at the battlefield when it resolves

Nuances:

• If multiple units with attack triggers move to the battlefield together (like Warwick and Crackshot Corsair), the controller can order those triggers on the chain, allowing combos like dealing damage first then killing the damaged unit
• Warwick's ability says "here" so if he is moved to a different battlefield before his ability resolves, it will kill damaged units at that new battlefield instead
• The attacker still has priority to act first after the initial chain resolves, even though Warwick's ability was on that chain