Last night on Talking Dead, Lauren Cohan spoke about the scene and compared Daryl's reaction to when Beth Greene (Emily Kinney) died.
"I think it was so painful... she could see what he was going through, so she tried to connected with him when they were out there and he's sitting away from the group at a picnic table. And I think when they are finally thrown together in the root cellar and they get to confront the issue... so heartbreaking because it's the same kind of guilt I think she remembers from him feeling with Beth."
"The moment with Gregory and Maggie is really interesting. It's a lot of information. We find out Gregory actually hasn't killed a walker, which is kind of stunning. We also see that moment where he's thinking, 'I could kill her [Maggie].'"
At the end of The Walking Dead Season 7, Episode 15, Gregory told one of the Hilltop Colony residents that he needed a ride. He also said for him to pack a bag. It is clear where he is going. Gregory probably wants to go to the Sanctuary to talk to Simon (Steven Ogg) and tell him that Maggie and Daryl are at the Hilltop Colony. Lauren Cohan teased that if Gregory rats them out, then there would be no other option but to get rid of him. By that, she obviously means that Gregory would have to die. If he told Simon and the Saviors about Maggie and Daryl, it would put their lives at risk. This is especially worrisome since Maggie is pregnant.