why does rengar win this fight?

Riven can outplay rengar if she times it correctly but if rengar gets the drop he may win. situational.

Because they both built pure damage so its really a matter of who hits first.

Well Riven has some hp but if its in Rengar's burst range its irrelevant.

because riven rushed a ghostblade as a second item like an idiot

If rengar lands the empowered bola from stealth riven cant use her shield or q for long enough to get bursted super low.

Rengar can just empowered bola from stealth to make most of her spells uselss. Once he uses that, he can delete her with an empowered Q combo.

how embarrassing.