By James Hibberd
Updated January 17, 2015 at 04:37 PM EST

Constantine is no Flash.

Unfortunately for the supernatural comic-book thriller, that’s not my observation — it’s the entertainment chairman of NBC’s remark to reporters on Friday when asked about the show. And now here comes some new ratings data that won’t help matters: Last night’s winter break return of Constantine saw the series fall to 3.1 million viewers and a 0.8 rating among adults 18-49 in its new earlier 8 p.m. time slot. That’s down 20 percent the drama’s last original episode in December.

At the TCA press tour yesterday, NBC president Jennifer Salke and entertainment chairman Robert Greenblatt both took on the question of Constantine, whose production has been capped at 13 episodes this season. Neither comment was really encouraging, especially after you factor in the Network Executive Comment Curve which demands executives add roughly 30 percent more optimism to public statements made about their shows.

“Still talking about [whether to renew the show],” Salke said. “We wish the show had done better live. It has a big viewership after [live airings] in all kinds of ways, and it has a younger audience. The live number is challenging. It hasn’t kind of come out of Grimm the way we wanted it to. We love the show. I think it’s fair to say we’re really still talking about it.”

Added Greenblatt: “We got on the bandwagon of these shows based on comic books, and maybe there are too many of them. It’s a popular series of comics, but it’s not The Flash. It’s not Batman, so maybe it suffers a little bit there. But as Jen said, it’s a show we really liked. We love Matt Ryan, who is the star of it. I think we did right by the fans who didn’t like the film that was made of it, and I think the future is still up in the air on that show.”

Also last night: ABC’s Shark Tank had its most-watched episode ever and hit a season high in the demo with 8.5 million viewers and a 2.2 rating among adults 18-49. Fox’s Glee (2 million, 0.7 rating) maintained last week’s series-low premiere number. Grimm (4.6 million, 1.2) was down slightly — not helped by shifting Constantine to a lead-in slot. Shifting from Monday, The CW’s Hart of Dixie (1.2 million, 0.4) was steady.