The only ADC with a lower win rate than Trist is Urgot.
http://champion.gg/champion/Tristana
So, in the last patch, they reworked Trist making her be stronger than only Urgot in terms of an ADC.
They reworked Fizz, giving him the 3rd lowest win rate when taken mid, and causing the pros to play him as an AD bruiser top lane, apparently. They nerfed Akali, giving her a winrate that's only higher than Gragas, in mid lane. And they reworked Ahri, giving her the highest winrate in the game.
5.2 was a catastrophe.
used his stealth to juke you.
. Don't worry, they'll fix it.