If Warwick's on-attack ability triggers to kill damaged enemies, and the opponent responds with Hidden Blade (from hidden) targeting Warwick, do both effects resolve (killing Warwick and all damaged units)?

Ruling: Warwick's ability will not kill any units if Warwick is dead when the ability resolves, because the ability says "here" and cannot identify where "here" refers to if Warwick is no longer on the battlefield. You will still draw 2 cards from Hidden Blade.

Sequence:

• Warwick attacks and his triggered ability goes on the chain
• Opponent responds with Hidden Blade from hidden, targeting Warwick
• Hidden Blade resolves first, killing Warwick and drawing 2 cards
• Warwick's ability resolves but does not kill any units because Warwick is no longer present to define "here"

Nuances:

• If Hidden Blade is played from hand (not from hidden), it can only be played when the state is open (no chain), which means Warwick's attack trigger would have already resolved - too late to prevent the kills