Zoro is angry at Enma and yelling "Damn it! Missed". I think it's pretty clear that he missed. Kaido is shaken by "Oden's aura" as he states himself, not Zoro lol.
I still think Zoro would have damaged Kaido, but let's tone it down. The move btw, is the some move used on Ryuma, and it's called something like "Flying Dragon: Fire Blaze" which is ironic because he literally just cut a Dragon's Fire lol.