Calma: Calm; so con calma, calmly. Also, calmato means calmed, relaxed.
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It was the first time Zhou Yongliang visit a prison. Never once in his life did he ever dream about visiting a scary place like the prison. He only saw how the prison looked like on the television, and he knew that prison was not a good place to visit.
When he finally got the opportunity to visit a prison, he couldn't help but feel nervous. The prison was a place for criminals, and he couldn't imagine if those bad people managed to break the jail and attack him when he was there.
That was such stupid thinking, but he believed that he should remain vigilant in a place like that. Sure, he had supernatural powers inside his body, but the powers were for vampires, not for criminals. His physic was too weak if he had to fight those dangerous criminals.