If a soldier sees his friend blown up, his brain goes into such high alarm that he can't actually put the experience into words, so he just feels the horror over and over again.
もし兵士が 友人が爆発するのを見たら 彼の脳は 危険信号を送り 体験を言葉にできなくなります すると 彼はただ恐怖を 何度も感じることになります