Enma pull out his haki , CoC is haki .
In chapter 1033 you see that enma was testing him haki wise.
After that he tell him self he go all out with Enma and it can have as much haki as it wanted you see ACoC around Zoro swords .
Which is why during the fight he had time limit cause enma was draining his haki be it CoA or CoC like crazy .
Please tell me why all of sudden you think zoro had ACoC around his swords in chapter 1033.
EDIT Yeah i dumb but i waiting for your answer.