Last week’s Season 2 reboot got the series off to a strong start – and tonight, Agent Coulson (Clark Gregg) and his few trustworthy associates continue to do battle with all sorts of enemies, internal as well as external. And in tonight’s episode, the trail of one particularly unstable and powerful villain leads them to a familiar face: Raina (recurring cast member Ruth Negga), who has some advice for the surviving S.H.I.E.L.D. members – advice they’re approaching very, very warily.