[quote]A+: It is possible to disappear completely and become almost impossible to be detected. However, efficiency will decrease once preparations to attack are taken.
C: Hides one's presence as a Servant. Suitable for spying. The rank of presence concealment drops considerably when preparing to attack. However, this condition does not apply to poisoning something.
D: Suitable for spying.[/quote]

Doesn't say anything about masking sounds. It's why *cough*Lancer*cough* was listening for blood dripping and the jangling of all the grapeshot in Assassin's body.

Even A+ Rank doesn't mean you're suddenly completely invisible and undetectable by any means. It simply means that it's all but impossible.

Indirect methods, on the other hand? Totally fair game.