QUOTE (Muspellsheimr @ Mar 25 2008, 11:50 PM)
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Counterspelling Fireball effectively adds your hits as bonus successes to the subject for resisting the spell. In other words, you can only counterspell in this way spells that affect a target & allow a resistance test.
No, it doesn't. Mage A casts a force 6 fireball on an area that shadowrunners 1, 2, 3, and 4, and the shadowrunner mage 5 are in. Mage 5 is counterspelling only himself none of his teammates. Mage A gets 2 successes on his spellcasting test. Mage 5 gets 3 successes on his counterspelling test. As per SR4, 175-176, "Hits generated on this test reduce the net hits of the spell's caster as with any opposed test." Counterspelling is added in addition to the body or willpower roll for resisting.
QUOTE (Muspellsheimr @ Mar 25 2008, 11:50 PM)
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Mana Static does not affect those in it's area, per se, it affects the ambient mana in the area, so unless your GM let's you use counterspelling to protect the ambient mana in an area for spell defense, you cannot counterspell it.
The mana in the area you say? SR4, 176, "A magician who is actively Counterspelling can even defend against spells she is unaware of—specifically, Detection spells and Illusion spells—as the magician is actively “jamming� the mana around him."
Now, I'm not arguing that it says explicitly one way or the other, but if the magician is "jamming" the mana around him, and someone casts a spell into that mana (such that the magician was in the area of effect) I'd call that he gets his counterspelling roll.
QUOTE (Muspellsheimr @ Mar 25 2008, 11:50 PM)
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On a side note, comparing a combat spell to an environmental manipulation spell simply because they both have an AoE is pretty retarded. If you have to make a comparison, use Ice Sheet. Can counterspelling help you maintain your balance? Counterspelling works against opposed spellcasting tests, not against success spellcasting tests, or tests against anything other than spellcasting.
Why is that so retarded? Of course counterspelling doesn't help maintain your balance, just as it doesn't help reduce the background count from an already active mana static. SR4, 175, "A magician can use Counterspelling to defend herself and others against a spell being cast." That doesn't say "but only on opposed tests" or anything of that sort. Is mana static a spell? Yes. Is it being cast? Yes. Is it against the magician or someone they are counterspelling for? Yes. They can counterspell it.
Now then, as for why my position is like this. SR4, 173 describes Area Spells under step 3, "Some spells target areas or points in space; in this case the caster must be able to see the center of the area affected. All visible targets within the area are affected; area spells can affect more than one target at a time." This means that ALL area spells do not target the people they are affecting, but target the point in space from which they originate. Yet, as you said, you CAN use counterspelling on a fireball. Mana Static also has an Environmental tag on it. SR4, 202, "Environmental Manipulations affect conditions such as light, temperature, gravity, etc." Ok, that explains how they can do their funky stuff, great. Now, you asked to use Ice Sheet as an example.
We'll break it down by the steps presented in SR4. Mage A wants to cast a spell, step 1, he picks ice sheet. Step 2, he decides to cast it at force 6. Step 3, It is an area spell, so he targets point 1. (He chooses point 1, because Mage B is within 6 meters of it). Step 4, he makes his spellcasting test, and scores 3 hits. Step 5, He doesn't get to resist the spell with body or willpower. He is counterspelling though, And as such, rolls his counterspelling dice alone. 4 hits. Enough to negate the spell entirely. Step 6, Mage A eats his drain. Step 7, The spell could've been sustained at this point if it had successfully been cast. Since it wasn't, nothing happens here.
Now, why do I grant the mage his counterspelling dice for resistance when the book doesn't explicitly say one way or another? Well, lets look at another manipulation spell, armor. An enemy mage casts armor on the mystic adept who is trying to sneak in using a ruthenium suit to avoid the guards spotting him as he makes his way in. The mage casts at force 4, he wants to light up the adept, so the guards will notice the adept is on his way in. The mage gets a whopping 4 successes. If counterspelling works as you say, even though the mystic adept doesn't want the armor spell to affect him, it does, the end. I think, if he wants counterspelling can apply, and his hits will reduce the hits the mage got as per normal.