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Ah... did I score a 0 just now? -1 for Warrior, -3 for bomb, +4 for Warrior Stab?

No, you actually won because the bomb gives -3 to the enemy.

Your roll = 4 - 1 (warrior) = 3
Siren's roll = 2 - 3 (bomb) = -1 (PASS)

Stage 1 result validated. 3 life points banked (current total 3), 1 flawless victory.

Ahhhhhh, thanks for that. That's super exciting!