The fan wondered if Batman was referring to Jason Todd, but Zack Snyder later responded that (at least in his mind), it’s Richard Grayson, a.k.a. the first Robin, who was taken away from Bruce Wayne, not Jason Todd, the second Robin.
Of course, given that a Nightwing movie is in development, that means that if that project goes forward, Dick needs to stay alive.
However, it remained uncertain whether this was a legit story element or was just a prop thrown onto the set as a joke.
It’s worth noting this isn’t the first time this twist has been brought up, as during Batman v Superman: Dawn of Justice’s shoot, a gravestone was spotted that read ‘Richard John Grayson.”