QUOTE (toturi @ Apr 11 2010, 04:50 AM)

But the character is using Infiltration, even if he is making such actions that are detrimental to his intent. As such the situation should not be immediately noticeable even if it is not hectic.
No, the character WANTS to use infiltration. I can't think of a single reason why he should be allowed to conduct 2 mutually opposing actions at the same time, and it seems like I'm not alone in this regard.
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Yelling is one of the threshold 1 examples in the Perception test tables.
Did you miss the part about only making them roll of they could reasonably miss it? Its not terribly reasonable to say you miss someone yelling at you from the middle of a quiet street, as such by the text in Using Perception, NO ROLL IS REQUIRED.
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Correct, that is immediately obvious. Someone trying to sneak to the middle of the street, while trying to yelling loudly in such a way that disorientates and confuses is not immediately obvious.
Actually is more so, because of how ridiculous it would look. I'd be more inclined to say the character missing someone just walking down the street casually because there's nothing special about their actions, but when trying to sneak in a place with no cover, and yelling at the top of their lungs.... that will get you noticed right fast. Automatically, and no roll required.
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My take was that the character was trying to use Infiltration while doing all those things, adding such slants to those actions such that while even if normally they may be immediately noticeable, they are not longer so because the character is doing so in a manner that befits the use of Infiltration.
Sorry but a skill to make you unnoticed can not be used while intentionally broadcasting your position like that. The rules clearly state only roll when there is a reasonable chance the characters could miss the event/object in question. Since the event is actually emitting an active signal which by its nature will make the source readily apparent, there is no need/reason to assume it will not be noticed, and as such no roll is needed.
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As Dr Funk states, Concealment affects all the senses, not just vision or just hearing, it affects Perception and all the senses Perception uses.
Yes and can dampen sound coming out of an area. Nothing in the description by RAW would even hint it is able to trans-locate the apparent origin of a noise far enough away from the source that the source will not be found by looking for it. The character can NOT yell in such a fashion as to disorient others with volumes less then 110 decibels, and you'd need more then force 6 concealment to hide a noise that loud. As such the sound escapes the area, makes it to the listener, and the apparent source is attributed to the first noise to reach their ears. This would be the shortest distance, and as such the true path back to the person doing the yelling. Physics says you lose, RAW agrees. Unless the GM is being very nice the rules suggest no roll is needed.