Someone has theorised he is imagining it because he is insane, like how he kinda projects his “love” (also theorised) for his mother onto Bum because they look similar.
Which is "my son turned old enough to look like his dad=my daddy/husband and now we're gonna murder that abusing cold son of a bitch motherfucker and me and my son-whom i'm in love with- can live together alone"
Brocon brothers never get old lol