Chance for double mini-boss?

[leaden basalt]

Is there a random chance for mini-bosses to spawn an additional copy during the run? I don't know what causes this, but I love when it happens!

[proud verge]

Seems like someone’s been colluding with the Fire King hmmmmmmmmmmmmmmm

[sullen python]

It’s from the curse lol

[leaden basalt]

Yeah, totally missed that. Thanks!

[sturdy coyote]

For future reference, here is a lvl 15 fire curse