Maxperson
Morkus from Orkus
I've already told you I believe it to be the implication created by the way in which the rules you already know where to find are written. That you disagree that the implication is made does not actually mean it isn't.
Since it is not written, that makes it nothing more than a house rule of yours.
There is no rule that does such a thing, because the words found in the rule you are mentioning do not mean what you are claiming them to mean - especially not when this rule starts with "Dungeon Masters describe hit point loss in different ways." which shows its meaning to provide suggestions, not enumerating the one and only way that hit point loss can be described.
Right. Different ways, but typically damage has no sign until 50%. Typically means 50%+. If something happens less often than that, it is not what is typical. You are free to describe damage however you like within those constraints. Unless you house rule a change anyway.
I'm not.
You just admitted to it above. You admitted that there is no such rule, so you must be making it up based on your belief that it is implied. Your belief in an implication is irrelevant, though. Implications are not part of the rules. Only rules are part of the rules, and no rule backs you up.