Dabi is a villain. You and him are fighting while waiting for Shoto and Endeavor to show up..Eventually Endeavor and Shoto show up and..Dabi says something..

Dabi: chuckles Come dance  with me in hell, father!?

Endeavor: W-wha..?

Shoto: looks ready to fight

Dabi: pours water on his hair, his hair dye going to his natural white hair color, smiling like a psychopath