QUOTE (Brainpiercing7.62mm @ Dec 14 2010, 06:12 PM)

Well, the most simple solution is that you end up with "immediately obvious" for anyone in the vicinity, who could see or hear the spell (don't know about hearing, actually).
Simple, but there still should be a distinction between obvious (no test necessary) and Threshold 0.
QUOTE (Brainpiercing7.62mm @ Dec 14 2010, 06:12 PM)

That just spells doom for the sneaking mage. No more running into places with high force invis up and stunbolting people left and right who might still detect you. You really need to sneak now, and not knock people out. Is it all bad? Not really, I guess.
a) We don't know if the noticeable phenomena from spellcasting are masked by (improved) Invisibility. At best observers will see flickering air or whatever (which were only introduce by SR4
A all previous editions didn't have the sparkles) without a source. Changes on the caster himself(sweat, furrowed brows, look of concentration) are definitely masked by Invisibility
b)the invisible mage remains invisible even if someone notices spellcasting.
QUOTE (Brainpiercing7.62mm @ Dec 14 2010, 06:12 PM)

If you do it mathematically:
Theoretically, most bystanders don't even have dice left to observe you if there are a few mods, plus being distracted.
True.
QUOTE (Brainpiercing7.62mm @ Dec 14 2010, 06:12 PM)

But a one die spotter can notice as long as they don't glitch. The 0 dice spotter is the only one who could not automatically notice a Force 6 spell, unless he rolls edge.
Nope. Everyone can glitch critically:
QUOTE ('SR4A p. 62')
If a character rolls a glitch and scores zero hits, then she has made a critical glitch.
Whether you passed the test is irrelevant to determine if the roll is a critical glitch. Only the absence of hits is important. So everyone no mater how high the dice pool can glitch critically.
QUOTE (Brainpiercing7.62mm @ Dec 14 2010, 06:12 PM)

And if you raise the force, and keep with the mathematic thing, that would give the spotter automatic net successes. (Because net hits= hits - threshold = 0 + 1 = 1) So they could be banging their heads at a heavy metal concert and still notice you using just a force 7 spell in the vicinity. And all the noise and distraction doesn't matter, because those modifiers apply to the spotter, not the spottee, and the spotter already has a net hit.
You could be right there. I'm not sure if such imaginary hits should be awarded to the roll, making Critical Glitches as above impossible. Normal Glitches though are still possible, though they won't help the caster much.
QUOTE (Brainpiercing7.62mm @ Dec 14 2010, 06:12 PM)

This is really a funny rule.
About as funny as Ghoulpocalypse by RAW.
BTW: What sense is stimulated by Spellcasting? Will augmentations to any sense apply to the test? Is it only visual?