Felix opens the door to this thread and tosses in a stun grenade
FOOM
Right. Everyone breathe deeply. Count to 10 before posting. Imagine this is a game we're talking about.
Ok.
The UD description as written with "even if" (and the DMG "regardless of") may be interpreted the way Caliban favors; it
also may be interpreted the way Artoomis favors.
If anyone disagrees with this statement, this is the part of my post where you move on to the next post.
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Still here? Ok.
Is simplicity a reliable way of determining meaning? It is subjective, so, no.
Is intent a reliable way of determining meaning? Were it so, Constitutional Law would be the easiest class in Law school ever, so, no.
Is syntax, semantics and logical rendering of the sentence a reliable way of determining meaning? One would think so, but this sentence is ambiguous (and you agree with me since you've read this far!

), and because it is ambiguous, grammar rules won't provide a clear answer, so, no.
What are we left with?
Perhaps the hope that an official fiat will come from WotC stating one way or another? Until we have this, until the ambiguity which is the root of the problem is cleared, we will reach no answer but only discover one another's opinions.
As for me, I think Uncanny Dodge is a representation of a preternatural awareness on the part of the character. I think it takes a reduction of mobility to void this awareness. I think that this interpretation of the rules is a valid one. I think I will disregard Skip's ruling because I dislike it for flavor reasons. I think it would be interesting to have professional logicians reduce the UD description to a mathmatical equation.
I think some folks here need to shake hands and make up. That, or settle your dispute outside. One or the other.