You die and an automatic bomb goes off below you and slows, negating sion's passsive completely. His grenade also slows sion during the beginning stages of his ult even though the ult states that Sion is immune to CC.
Oleandervine6 votesSlowing the beginning of his ult, if Jhin is that close, is utterly irrelevant because Jhin is going to get hit by a charging beast. Also, Sion's passive is already lackluster, so the death flower is not really interfering that much. Sion ruins Jhin a lot harder with everything he has. He has stuns, slows, and armor shred, as well as a shield, which will invalidate 1 of Jhin's 4 bullets. Jhin is no counter to Sion.
Sniper 02 votesThis^
Requiemsfire4 votes
is an even harder counter, the match up is basically impossible unless the Vayne is incompetent.
Jhin is at least immobile so you do have a window of opportunity to land your CC.
HorusEye2 votesJhin & technically other 99 champions counter him, so this is nothing special.
Sniper 01 votes"COWARDS!!!!" 
http://i.imgur.com/xcQj4BG.png
Lovelle1 votesCaitlyn is much worse. She'll just lay down traps and then "see ya nerd" with her dash + slow.
