Can multiple Immortal Phoenix cards be summoned from trash with a single kill spell, and can they be summoned during enemy attack in a showdown?

Ruling: You can summon multiple phoenixes from your trash from the same kill spell as they all trigger individually. If you control the battlefield, you can summon the phoenix there even during showdown/combat.

Sequence:

• Kill an enemy unit with a spell
• All phoenix triggers activate individually
• Summon each phoenix to the battlefield you control

Nuances:

• The phoenixes can be summoned during enemy attack/showdown as long as you control the battlefield being defended