So I take it from the ending that Chase is not at the base
Unclear.
Still ten steps ahead though.
The whole heartbeat thing was OTT even for the comic book realm and this show
Yeah, that was a bit silly, but not the silliest bit of tech on the show.
(They should have just brought in McCoy with his heartbeat silencing microphone to the cave instead of going through all this, he would have found Chase in no time

)
Diggle's the moral center of the team now
His moral outrage at black sites and holding people without due process would ring more true if they themselves(him included) hadn't engaged in such behaviour in the past, and weren't actively trying to kill Chase just a few episodes ago...
No flashbacks this week, and despite having extra time in the present, the episode felt a bit too fillerish.
Bringing ARGUS in seems superfluous considering they'll probably go away now and let Oliver handle it anyway. After taking tiny steps, Felicity finally took a giant leap to the dark side, wrapping up the Helix thing(for now), but the team dialogues were kinda tired and generic(trust, going too far, blah blah) so it was a bit underwhelming.
Rene and Hoss parts were the highlight though.
