The Wizard World New Orleans comic-con featured a Captain America: Civil War panel with Frank Grillo being a member.
During the audience Q&A, the panel was asked if there was a scene they wanted to film, but haven't been able to yet.
Frank Grillo responded by stating, "I would like to kill Captain America."
This is potentially a spoiler as if Grillo didn't film the scene, we then know Crossbones doesn't kill Captain America in Civil War.
Anthony and Joe Russo were quick to follow up Grillo's comments with:
"We may or may not have filmed that scene, though," Joe Russo stated.
Anthony Russo added, "She said a scene that you haven't done."
Earlier in the panel also saw Frank Grillo talk his relationship with Captain America and state he thinks the Crossbones costume is the best.
"In the first film, I was friends with him [Captain America]," Grillo offered. "You know, there was this moral problem I was having, but not in the second one [smiles]. I have a clear cut mission.
"I got to tell you, when I saw the costume, when it was done, to me - I know you guys all have these fancy costumes and stuff - I think Crossbones has the baddest costume of everybody," Grillo said.
Grillo also told the audience the characteristic from Crossbones that he would want in everyday life.
"I would be homicidal," Grillo joked, to the delight of the crowd, which erupted in laughter.
Update: Grillo also offers up what Marvel character he would like to interact with that he hasn't, which offers another potential Civil War spoiler.
"Spider-Man. I love Spider-Man," Grillo said.
Joe Russo then questioned, "You haven't interacted with Spider-Man," to which Grillo joked, "I have interacted with Spider-Man. It's none of your business." The Russo brothers and everyone can then be seen laughing.
frank grillo as crossbones pic.twitter.com/0eS2Mpqvz3— rodrigo (@chrisevnsr) January 5, 2016
"Captain America: Civil War" has a May 6, 2016 release date directed by Anthony and Joe Russo starring Chris Evans, Robert Downey Jr., Scarlett Johansson, Jeremy Renner, Elizabeth Olsen, Sebastian Stan, Anthony Mackie, Frank Grillo, Paul Bettany, Don Cheadle, Emily VanCamp, William Hurt, Martin Freeman and Chadwick Boseman as Black Panther.
Captain America: Civil War picks up where Avengers: Age of Ultron left off, as Steve Rogers leads the new team of Avengers in their continued efforts to safeguard humanity. After another international incident involving the Avengers results in collateral damage, political pressure mounts to install a system of accountability and a governing body to determine when to enlist the services of the team. The new status quo fractures the Avengers while they try to protect the world from a new and nefarious villain.
Captain America: Civil War Trailer