Apart from there being no fence in "Christminster", there are three
reasons why I didn't allow this.
The first reason is to make sure the player keeps in character.
Christabel is not the kind of woman who is capable of killing someone in
cold blood, especially not for such a stupid and trivial reason as
climbing the wistaria.
The second reason is plausibility. Christabel is a diminutive woman who
is quite incapable of physically harming a burly man like the porter.
The third reason is that I am not interested in writing about casual and
petty violence. (But try attacking Catharine in "Magic Toyshop"...)
-- Gareth Rees