So he didn't hack - there was a bug with the supply crate items, Sunset basically overloaded it and amplified the effect to crash every channel by activating the bug numerous times all at once, freezing and then killing everyone but himself since he set it off.
It's like the equivalent of using one grenade to set off ten nuclear bombs.
Im still not sure how he wasnt affected at all
it's because he casted the buffs, so it doesn't affect him.
his class also makes him fly a little, so it's hard to attack him
He has buffs he cast to trigger it, making him immune to it. Basically it counts as "his" attack and thus doesn't harm him.
He's also, like Blue said, a flying character.
a hacker in the traditional sense or is it something else entirely in games?