请分析个句子

对，that I had heard described是定语从句，形容hellish look的。我听人描述过的，意思就是传说中的。
hellish look seem to leap into it，是说地狱般的相貌迅速浮在他脸上。。。

the count turned his face, and the hellish look seem to leap into it.

that i had heard described是从句成分

当我们冲进房间, 伯爵把脸转了过来, 那个样子就仿佛是我曾经听说过的地狱般的脸在现实中呈现一样.

那传说中可怕的表情就好像瞬时跃上他的脸上一样。
and the hellish look that I had heard described seem to leap into it
这里的heard described是双宾语，所以整个句子到described是前半段，后面的leap into可以是“快速跳跃的”的引申意思，表示表情变化很快，比较剧烈。