Soraka only has the silence from Equinox (E) and Starcall (Q) poke with no mobility, so once Death Sentence (Q) lands she gets pulled in and killed on the spot.

In the early game before Yuumi attaches with You and Me! (W), if her body gets caught by Death Sentence (Q) she instantly dies with no way to escape.

Senna is slow and has no dash, so after Death Sentence (Q) lands she keeps losing the trade to Flay (E) plus auto-attacks.

If Lux misses Light Binding (Q), Thresh counter-hooks with Death Sentence (Q) and creates a guaranteed kill setup with the Flay (E) knockback.

Zyra has zero mobility, so once Death Sentence (Q) catches her she gets locked down before setting up her plants and loses the trade.

Leona lands first with hard CC via the Zenith Blade (E) dash and Shield of Daybreak (Q) stun, engaging before Thresh can line up Death Sentence (Q).

Pyke dodges Death Sentence (Q) with the stealth of Ghostwater Dive (W), and up close executes Thresh first with Death From Below (R).

Nautilus lands the first grab with Dredge Line (Q) and stacks the repeated CC from Staggering Blow (P), giving him more reliable engage than Thresh.

Morgana fully negates both Death Sentence (Q) and the Flay (E) knockback with Black Shield (E), shutting down Thresh's engage.

Blitzcrank grabs first with the longer-range Rocket Grab (Q) and the Overdrive (W) speed boost, opening the trade before Thresh can.