The Thresh hook. Which one is correct? Look at picture.

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Youve given me no indication you understand hit boxes despite saying you do is the thing. Your entire argument hinges on "BUT IT MISSED" when clearly it didnt - hit boxes still collided. A quick google search provides several reasons why it connected, none of them being "THRESH HOOKBOX TO BIG RITO". You know what those reasons are?

1. Vayne hitbox is larger than it should be in comparison to model size
2. Tumble hit box might not move until vayne completes the tumble ( Vaynes hit box being larger than it should be is plausible. Tumbles hit box not moving with vayne is old, but also fairly probable although i wouldnt put stock in it.)

I can say i understand how plasma happens all i want, but if i insist that i can make plasma with an unprepared marshmallow and a standard consumer microwave people are going to question whether or not i understand plasma.

You have given me no proof that you understand hit boxes either in that regard. If you automatically distrust anything I have to say then why ask in the first place? I never said "it missed" I said multiple times it wasn't the fact that it just missed visually, it was the distance that it missed by that was my issue. Had my character been maybe 15-20 units to the right, it still would've missed visually, but I wouldn't be bringing it to the forums, due to my understanding of hit-boxes. My qualm was with the extent that it missed by, not just the fact that "it missed." And re-reading your post, I guess you assumed I was like a 5 year old? or what? (Idk if this is it, I kind of assume everyone is an idiot too, but I at least give them a chance, maybe you should try the same). I obviously see that it "technically collided with hit-box," or else it wouldn't of landed and I wouldn't of died a miserable death to Miss Fortune ult.

And I will say, you very well may be right on that, it might be a matter of Vayne's tumble not properly registering her hit box's movement in sync with gameplay. It could also be that the specific soulstealer skin I was using had a faulty hit box. Or Vayne having an extremely large hit-box. Though it just seems odd that I can have over 2 million mastery points with Vayne on 3 different accounts and have never seen anything this absurd hit me. I realize that it could be one of many things, and in that light, I was wrong to immediately mention Thresh hook being the problem. I think I did it to relate to this post. But you are right in that regard, it probably isn't the Thresh hook that's the problem at all. But while I can't pinpoint the catalyst with the resources available to me, I can at least deduce that there is a problem. And that's all I really wanted to point out initially.

I see you are a practical person, so let's take your analogy about plasma and actually apply it to this situation correctly. Lets say you have no idea what phosphor is or how a plasma affects it. Let's say you then buy a plasma screen TV, a month later you notice an image has left a "mark" commonly known as a "burn-in" or "screen burn." Did you really need an extensive knowledge of what plasma was or how it works, or how it reacts with the luminescent phosphor molecules in your TV to understand that something is wrong? Probably not, unless you were blind. Your analogy didn't work because I am simply stating there is a problem. Not claiming to know the solution. And also the word "understand" leaves a little room for ambiguity. I may not know how to code a game as complex as League of Legends, and therefore my understanding of hit-boxes is limited to an understanding of what they are and the basics of how they function (making a set of dimensions 2d or 3d and setting conditions based upon whether an ability enters those dimensions or not). But that doesn't mean I can't pinpoint an issue if I see one.