Honestly it was expected that Marco would bleed a little bit King with two named attack but King who cut his left arm like butter and forced Marco to regenerate a full lost member is good because it's the better way to exhaust marco.
And it's not even a named attack, nor using his DF power, and seems like King didn't even use his species special ability (fire ?).
I like this!
Marco vs King is good!
As I said, it's likely that King's advanced Haki equivalent to FS is barrier haki on a very high level.