Thresh lantern needs some kind of counterplay
This is the most frustrating thing about playing against Thresh, when you have what seems to be a certain kill and then whoosh, they're just gone and there was nothing you could do about it. The best you can do is try to stand on the lantern and block the enemy from clicking, but that isn't an option at all when the lantern is closer to the enemy than yourself. And even when it is possible it's still hard to pull off and unintuitive.
There could be a brief channel, say 1 second, when someone clicks the lantern, and if the channel is interrupted the pull is canceled. During the channel the lantern-clicker gets a large shield so they don't just get blown up.