Never mentioned the ADC
Yi is the crit carry here.
just do the math. 700 - 70 = 630 (use 700 because the lager the auto attack the more damage ninja's block just as an example )
you had literally nothing to defend yourself against yi. your early game focus should always be to fuck over yi in some way. if you can not snowball the lanes just provide pressure and counter jungle with vision. Yi is bad because he crumbles against any early game pressure which denies him his mid game power. its the same thing with yasuo, you're trying to slow down his scaling and prevent them from power spiking until your team is equipped to deal with it. thats why you see yasuo's and yi's get crazy scores in low elo's. because a lot of the time, the enemy team does nothing to prevent them from power spiking early and they can proceed to be a monster for the majority of the game.