Lets talk about Kalista and Thresh synergy.
Before we start i would like to ask the question, if thresh throws his lantern before getting kalista ulted does the lantern persist? If so kalista thresh will be literally inescapable. Thresh lanterns for the jungler, kalista ults them both into the enemy adc, thresh ult flay, jungler uses whatever cc they have kalista is beating on them, they flash thresh hooks them back in. Also lets not forget that good thresh's generally try to harrass with their wind up auto's, kalista w proc on top of that is just ridiculous.
