Bagpuss said:
Without using Metagame knowledge anyone would expect a swift blow from a sword would decapitate any unaware opponent no mater how skillful they were. The fact the player described it as a killing blow tells you nothing of the danger this character could have presented if he was allowed to pull his trousers up, and be made aware of the threat.
Well, there are alternatives in between a decapitating stroke and saying "Fill your hands you son of bitch!".
• The paladin could have struck for subdual damage.
• The paladin could have grappled.
• The paladin could have knocked the rapist to the floor.
• The paladin could have grabbed the rapist by the collar of the and dragged him into the public bar with his trousers around his ankles.
And for every scenario you might present in which these approaches were likely to present a danger to the girl under D&D, there is a scenario just as likely in a D&D world in which the apparent rapist was innocent of any willing and witting evil.
• The rapist might have been a high-level monk. But he wasn't.
• The rapist might have had a very lethal concealed weapon. But he hadn't.
• The rapist might have been a sorceror. But he wasn't.
• The rapist might have been a powerful monster in disguise. But he wasn't.
If you are going to defend the paladins actions on the grounds that he had to consider what might have been, you have to accept that that blade cuts both ways.
• The rapist wasn't possessed. But he might have been.
• The rapist wasn't subject to a magical mind control. But he might have been.
• The victim wasn't a prostitute under an illusion acting out a sex game. But she might have been.
• The situation was not a set-up, fake from start to finish. But it might have been.
If you are going to judge the 'might-have-beens' you have to judge
all the 'might-have-beens'. And if you do, Vindicator's character still comes up as having done wrong. So let's just stick with the facts.
Though: one day one of those 'might-have-beens' will be a 'was'. Circumspection!