A younger guy warned me to watch my back.

一个年轻人警告我要小心。

Watch my back, hero. - Found something.

替我盯着点 大英雄 -有发现。

From now on, I'll be watching my back and looking out for my own interests.

从现在开始，我会小心翼翼地照顾自己的利益。

So if you really want to watch my back, I guess you'll have to stick around.

如果你真想照顾我的话 那你就要跟紧一点。