Spell Turning clarification

[caliga]

This may seem silly, but I'm having some trouble understanding some of the wording of Spell Turning.

Spoiler:

Spells and spell-like effects targeted on you are turned back upon the original caster. The abjuration turns only spells that have you as a target. Effect and area spells are not affected. Spell turning also fails to stop touch range spells.

From seven to ten (1d4+6) spell levels are affected by the turning. The exact number is rolled secretly.

When you are targeted by a spell of higher level than the amount of spell turning you have left, that spell is partially turned. Subtract the amount of spell turning left from the spell level of the incoming spell, then divide the result by the spell level of the incoming spell to see what fraction of the effect gets through. For damaging spells, you and the caster each take a fraction of the damage. For non-damaging spells, each of you has a proportional chance to be affected.

If you and a spell casting attacker are both warded by spell turning effects in operation, a resonating field is created.

I suppose the main question is I'm just not understanding the math behind spells that exceed your total spell levels.

Ex. You can turn 10 spell levels, a 30th level spell is cast on you. 30-10 = 20; 20/30 = .66. So you take 60% of the spell effect. What's 60% of a Dominate person or similar non-damaging spell?

For the second bold part, what is the proportional chance to be effected? Is that what the 60% is actually referring to? Meaning we both have a 60% chance to be effected?

Any assistance in further breaking down the spell during events that the spell targeting you is greater than the spell levels you have left would be appreciated it.

[Jeraa]

caliga wrote:

Ex. You can turn 10 spell levels, a 30th level spell is cast on you. 30-10 = 20; 20/30 = .66. So you take 60% of the spell effect. What's 60% of a Dominate person or similar non-damaging spell?

For the second bold part, what is the proportional chance to be effected? Is that what the 60% is actually referring to? Meaning we both have a 60% chance to be effected?

Non-damaging spells still have their full effect. The proportional chance is to determine who gets affected. In your example, the spell turning stops one third of the effect, meaning you have 66% chance of being affected by the spell, while the caster has a 33% chance to be affected by his own spell.

A least, that is how I think it works. Its how I would do it at least.

[Trikk]

Jeraa wrote:

Non-damaging spells still have their full effect. The proportional chance is to determine who gets affected. In your example, the spell turning stops one third of the effect, meaning you have 66% chance of being affected by the spell, while the caster has a 33% chance to be affected by his own spell.

A least, that is how I think it works. Its how I would do it at least.

This sounds correct.