I have to talk about the plot with Elena and her professor. I hate it! She starts to sleep/date her professor. They never really dive deep into it; I hope they will next season because they just left it.
She begins to work with shady hacking \"hactivist\" organization known as Helix in order to find and stop Prometheus, which ultimately brings her into conflict with Oliver and the team when she aids Helix in freeing their leader, Cayden James, from an A.R.G.U.S. prison. While Oliver and her are arguing, Prometheus sets off an EMP, which completely fries all the electronics in the bunker and temporarily disables her spinal chip, which enables her to walk. This causes Felicity and Oliver to become trapped in the bunker. Felicity argues with Oliver that he doesn't trust her after she tells him not to go up the elevator shaft because Prometheus had rigged it and he ended up doing so anyways, ending up falling and getting impaled by bolts on the ground. She ends up helping him band