Thresh vs Janna

Open with Flay (E) before Death Sentence (Q): the slow makes the hook much easier to land.

In lane, space out your autos: Flay (E) charges them passively, and the longer you wait between two autos, the more damage they deal.

Don't recast Death Sentence (Q) on reflex: the target is already being pulled toward you, and jumping on them often exposes you for nothing.

Throw Dark Passage (W) toward an ally in trouble before they need it: they can click it to come back to you, with a shield.

Place The Box (R) right after a successful hook: to escape, the target has to break a wall, and the first wall broken slows them and deals full damage.

Avoid trading while her ally has Eye Of The Storm (E): the shield absorbs your damage and gives them AD.

Bait out Howling Gale (Q) or Monsoon (R) with a first engage, then re-engage right away: one has a 14-second cooldown, the other 130 to 100 seconds.

If you have CC, save it for Monsoon (R): after the knockback, she heals her allies as long as she stands still, and interrupting her cancels the heal.