While it's true that going against the No Life King is suicidal, Alucard way of thinking and how he viewed human lives has changed significantly...meaning he gives them a small chance for survival. But that's his secret.

Alucard eyed the young swordman's evenly with no fear. "You're a foolish boy, defending an ideal that you don't understand." He smirks. "You're free to die for what you stand up for."

For that reason, Suzaku will be severely punished. Alucard's red eyes glow eerily with a hungry bloodlust. He is eager to be this boy's challenge and nightmare. "Come on, come on, what you're waiting for? Slice me, dice me, show me everything you got! I'm bored of waiting!"

It's always Alucard way to allow the opponent to strike first, and return the damage a thousand times fold to give them a nightmare and a battle they won't forget!