Can you use Get Excited (an Action spell) to kill Warwick in response to his 'When I attack' trigger after he enters the battlefield via Bullet Time?

Ruling: No, you cannot use Get Excited to kill Warwick in response to his "When I attack" trigger. Action spells can only be played in an Open state (when no chain exists), and when Warwick attacks, his "When I attack" trigger is immediately put on the stack along with any "When I defend" triggers, creating a chain before you have an opportunity to respond with an Action spell.

Sequence:

• Warwick initiates the attack
• "When I attack" triggers are put on the stack
• "When I defend" triggers are put on the stack
• The chain is formed with no window to play Action spells before these triggers resolve

Nuances:

• Action spells can be played during Showdown Open states, but only when no chain exists
• Non-action and non-reaction cards can only be played in a Neutral (non-showdown) Open state