@Razh:
Mihawk didn't take a different tactic. He just repelled the Muggy ball back into Buggy's face. After which Vista clashed swords with him. Can't make anything out of that.
He slashed him in half when Luffy threw Buggy in the way. Two panels later he cut Buggy to ribbons. Then Mihawk took an offensive stance against Buggy while his flying torso attacked.
He cut him several times, on camera. In the manga.
After that, he switched over to just repelling the bomb.
A switching of tactics, rather than trying to cut him again a different way. Maybe he didn't take it seriously enough to apply Haki, Oda hadn't started doing the black fill in effect yet so we'll never know… but regardless, Mihawk felt it wasn't worth any further effort to try cutting Buggy after slashing him multiple times.
@airy-0:
But it is possible. Every group had different levels of strength. Cavendish, for example, one shotted everyone in that group, as strong as he is, somehow even robin could stop him, his group was not strong at all.
He did that after everyone had been fighting for a while and no one was prepared for the super fast attack (except Rebecca).
Robin managing to deal with it can be assumed among other things
a)is at that level after 2 years of training
b)was able to focus on the one opponent instead of a whole arene
c)is used to splitting her attention and focus, especially now that she can do two full bodies at once.
These are all thigns we've demonstratably seen from her at this point.
It's possible that Burgess had a group similar or slightly weaker.
It's possible but NOTHING in the story indicated it. NOTHING. You have to make up the extra facts entirely whole cloth to come to that conclusion, when the thing supported and intended from the story is that "woah, Burgess is strong." The announcers didn't go "that block sure was full of weaklings" they went "that guy sure was incredible!" Everyone else in the prep room didn't go "ell yeah, that was a bunch of weaklings out there, the real toughies are still in here" they went "woah, that guy was strong!" His victims and Franky supported this as well.
If you have to ignore multiple context clues, and then make up things from thin air, then you're not reading or interpreting the story very well.