Thresh has a PERMANENT slow.
Theoretically. Thresh has infinitely scaling armor. Randuin's Omen's slow duration scales with armor.

Discuss.
(this will never happen in a real game)
EDIT: why is a discussion thread being downvoted? no one thinks the idea of thresh being able to slow you for like 30 seconds is a funny concept
you walk up to thresh, he slows you, walks like 40 feet away and starts recalling. you don't make it to him in time to stop him and are still slowed after he gets away

COUGH
: Woof <3
. He has natural Randuins on him anyway.