Can they rush in after the first two words, before you say “not”? Can they enter if they stuff their ears before they hear the final word?
the preferred nomenclature is “come back with a warrant”.
No. It is magic so they would not be able to enter partway through an answer as doing so would make it clear that the vampire knew it was really a no.
What’s the longest duration between may and not that would be valid in keeping them out?
It seems to me that the wording itself is unimportant, but rather the intention. So I would imagine no
Don’t forget that a door mat that says “welcome” counts as consent.
Depends, is this vampire known as Brock Turner?
You mean the rapist Brock Allen Turner?
You mean Brock Turner the rapist?
“No.”
“You mayn’t” as well.
Imagining a vampire showing up to Wayne and Garth’s studio.
“You may come in… NOT!”
Borat’s House:
“You may… NOT come in.”