Seeing the scene, they didn't know how to react. The scene is as unbelievable as it can get. Not only was Rank-S beheaded, but the time it took was also only a few minutes.
This kind of thing is unbelievable even when two Rank-S were to fight. It would take hours before the winner is declared.
And the winner would also not be dead. At most, he/she might escape, and only die if he/she continues to fight even when he is at a disadvantage, which is a rare case. Most of the time, they would prefer to run away.
That's the only way one could kill a Rank-S person is to be much stronger than him. So strong that he wouldn't be able to escape even if he wanted to.
And that was exactly the case! Zero killing Rank-S Devil Contractor doesn't mean he is on par with him, but that he is much stronger. And looking at the time taken to kill S-Rank Devil Contractor, it was for certain that he was indeed much stronger than Kurtis.
"T-This… How?"
"I-I can't believe this!"
