日本語 Japanese Ask Questions Thread 4

If you have a question about the language, ask it and fellow 4channers might see it and answer it for you.


Japanese Ask Questions Thread2
http://dis.4chan.org/read/lang/1206158123/1-40

Japanese Ask Questions Thread3
http://dis.4chan.org/read/lang/1267485093/1-40

そいつが無理なことはきさまがいちばん知っているはずだ。

How does this translate to? It has 2 subject particles, so it means there are 2 different people?

Does this sentence mean? You(X) are impossible(?), He(Y) is the first, you (Y) should know that.