Yes Mr Greer gave Root the slip by elminating sound, sight, any source of tracking device nearby but I give props to Root for using the least common of the five sense in tracking him down a 2nd time. Smell.
Root Bear as I like to call it is a funny pairing that has never happened before. Or Root Beer if you prefer.
The rest of the episode was pretty hum drum and predictable. The master plan of gathering hardware, software and no a means to cool and power it up was what the enemy was after so now we are just waiting for Samaritan to start up. I am willing to bet that even the baddies don't know what they are getting themselves into.