Of his own volition he had become a beast, a beast he had lived, a beast he would die.

他自愿成为一头野兽，一头他活着的野兽，一头他会死的野兽。

For your information, he is in command of his facilities, and is cooperating with me of his own volition, and there is no invasion of any kind.

供你们参考，比尔掌握着他的自然能力，并且是出于他自己的意愿与我合作，没有任何形式的入侵。