Another excellent episode. I too enjoy how the storylines intersect.
The part where Reese finds the fridgefull of heavy weaponry but it's "nothing unexpected" was good and calls back to Reeses collection in the library that Finch didn't approve of in Season 1.
Is Kevin Chapman doing another show or working on a movie? It seems like he only gets one or two short scenes every week.
I liked Finch and Roots conversation at the end. Who can really say what the Machine wants? But I'm eager to find out what the new "third catagory" is.