Thresh vs Alistar

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.

Take a trade right after his Headbutt (W): without it, he can't engage from range, and its cooldown is 14 to 10 seconds.

Back off when his carry is close enough to follow him, and play hard when they're far away: an Alistar engage only kills if someone follows up.

Once he hits level 2, stay out of Headbutt (W) range: combined with Pulverize (Q), he knocks you into the air as soon as he arrives.

If you have CC, save it for after Unbreakable Will (R): the spell removes the CC on him when cast, but doesn't protect him from what comes next.