Well the latter word "shit" is slang and means poop. It is usually used as a swear word or in other words cursing. So the whole things means "red poop". I don't know the context in which you are referring this to, but literally this is what it means.

Hello Liusu, In the sentence, the person had thought before she had pulled him in. It is used in the past tense because the action of him thinking was something that happened before the action of her doing something. I hope this helps and isn't confusing!

I completely agree with Eamon, that English is a strange language. If you want a definitive answer, when you say"it is kind of you" that means that the person is doing something that you find is kind. When you say "Its kind for you" it is as if you are asking them to do something. That is how I perceive it, and I am a native speaker. Hope this helps!