On p.247, under Targets, the example says that a power of the fourth Circle is needed to affect people within 100yds radius of one another.
On the same page, under Scale, we get the explanation: "The range of a power determines the maximum distance between the Demorthèn and the spot where the power is summoned. The area of effect is always calculated as the diameter of the circle and spreads from the spot where a power is summoned. Thus, a power of the third Circle can affect a spot distant from 50 yd at most, and within a radius of 50 yd."
A couple of things confuse me here. First, the first example has the area as the radius, but here it's said to be the diameter and not the radius, and then it's the radius again. (In the example on p.249, it's diameter.)
Second, if I can summon a power 50 yds away, which has a diameter/radius of 50 yds, then the outermost edge of the effect is 75/100 yds away in total (depending on whether it's diameter or radius): 50 yds to the epicentre of the area, plus the area itself. But the description says it affects a spot 50 yds away at most.
Thanks in advance for any help.
