如何理解as soon as look at you?

有一读者问： 我在英国著名作家Graham Greene所写的小说《布莱顿硬糖》(Brighten Rock)中遇到这样一个句子：

He'd kill you as soon as look at you if he thought he wasn't safe.

这句话不难理解，但如何分析as soon as look at you?

这是口语化的一种说法。这里的第二个as是连词，让我们姑且认为其后省去了主语he吧。