(Gameplay) Furor + Black Cleaver impares movement at red base

I was playing as Jinx and had furor berserker boots + black cleaver, we were taking out red's mid inhib when I decided to flash and AA enemy's TF, after the 3rd auto attack_** Jinx started zigzaging**_ at mid pursuit of TF instead of going in a straight line, there were no minions or obstacles in between plus I had phantom dancer anyway. I couldn't catch TF, he didn't flash or had anykind of allied speed boost to outrun me, it was definitely the zigzaging that made me miss the free kill.

I forgot to mention that I was in fishbones mode (rockets).