I found a line I remember in the script:
Quote
"@Dd looks almost panicked. \"Hey, why aren't people bringing me bananas anymore! I'm hungry! Help! Don't let me starve!\"",
But I am pretty sure what he said when I went to challenge him was something along the lines of "It's
your fault I'm starving! No way would I let you challenge me now."
I am
somewhat sure he didn't let me fight him, but I'd have to boot up the game again to check.
EDIT:
Ok I've found exactly what triggers it. Huang will let you challenge him so long as
at least one imperialist is still alive. As soon as you kill all the imperialists, he gives you this line.
I had one guard left running around with no arms when I went to test this, and he let me challenge him. I declined then killed off that guard, resulting in this line from him when I tried to challenge him again.
So yes, you can kill almost all the imperialists and still get the belt of levitation. Just be sure to leave one limping around somewhere. The only difference between this and doing it without killing Decos is that you don't get the banana endorsement shirt and the relevant lines of dialogue after winning the match. Huang just says "here's a little something from me", gives you the belt and teaches you some "nasty fighting techniques".