Okay, just checked. This is just from the Blake Neely score of the show (he did all of them). I am not sure you can find the name of that specific track but there is a soundtrack available. You can also listen to it on Spotify or Youtube or wherever, but as I say I don't know the exact cue for that riff (if this is where he is talking about noticing the scuffs on the shoes of the guy in the wheelchair.)