The way Grant Gustin is describing The Flash’s season finale, the upcoming episode should come with a Surgeon General’s Warning. After promoting tomorrow’s episode, “Fast Enough,” as “heart-breaking” on Twitter last week, Gustin is now promising another potential physical side-effect of watching the finale: Gut-wrenching. As Gustin shared in a recent interview, Barry Allen’s struggles against the Reverse Flash are far from over this season.
