Steve what he's talking about is fences that aren't perfectly erect/straight. If a fence is cattywampus in any way, then the OB "line" has to be different at different heights. There's no way around that. If for example a fence is irregularly-shaped or perhaps leaning 10 degrees somewhere along the way, what's inbounds/out-of-bounds at the base of the fence may not be the same if it's stuck in a bush at 3 feet in height. So, though it's not specifically addressed in the rule, if that fence is leaning, you really have no choice (assuming the TD said the fence was the OB/IB boundary). Sorry, I'm with Chuck. It has to be a common sense interpretation.
Btw, the ones that aren't perfectly erect/straight -- that's just about every one.
Oh, thank you. I have never seen a fence in real life. :\
Anyway, now that I have been edumacated about cattywampus fences...
The way around having an OB line that varies by height is to use the rules as written. The out-of-bounds line represents a vertical plane.
Picture it this way: If the sun were directly overhead, the shadow of the fence would show where the OB line intersects with the playing surface. If the shadow of the fence falls on the disc, that part of the disc is OB for being on the line. Also, if the shadow of the disc falls on the fence, that part of the disc is OB for being on the line.
Your example of "what's inbounds/out-of-bounds at the base of the fence may not be the same if it's stuck in a bush at 3 feet in height" makes my point. Actually, the position of the disc in the bush IS at the base of the fence. (802.02 Establishing Position C. If the disc first comes to rest above or below the playing surface, its position is on the playing surface directly below or above the disc.). A vertical plane helps the OB rule and the above-the-playing surface rule get along nicely.
The Q&A addresses a flexible fence that moved. All it said was that the OB line moved when the fence moved. It does not say the OB line is different at different heights. It did not need to change the written OB rule to give the answer it did.
I agree that sometimes this will result in weird situations like a disc being OB for lying under a part of the fence that leans toward IB. But, that's the way the rule is written. Better to deal with it than create a new rule – known only to some - that can't be looked up and may generate a whole new set of weird circumstances.
The take away here is that it's not always obvious what the best way is to define OB when there are fences involved. It's a PITA to have to mark a line offset from the fence a foot or so to avoid using the fence. On the other hand, if you use the fence in some way to define the OB line, it can be tricky using the correct words so rulings for discs landing in unusual positions go the way that "seems right" to the players.
True.
True for either interpretation. So, we might as well use the one that is written in the rules.