When does Warwick's effect activate, and does it remove units before combat damage is calculated?

Ruling: Warwick's effect activates after he lands on the battlefield during the chain phase, following reactions and "when defending" abilities. Units killed by Warwick's effect are removed before combat damage is calculated at the end of the showdown.

Sequence:

• Warwick lands on the battlefield (enters the chain)
• "When defending" abilities trigger
• Reactions trigger
• Reactions resolve first
• "When defending" abilities resolve
• Warwick's effect resolves
• Combat damage is calculated at the end of showdown (only with units still on battlefield)

Nuances:

• Units killed by Warwick will be in the trash before combat damage is resolved, so their might does not contribute to damage
• This principle applies to any spell or ability that removes units during the showdown - only units currently on the battlefield at the end contribute their might to combat damage