Spells are not physical, so they are not targetted physically. Rather, they are aimed by the mental map of reality that we all have. This is why they can be aimed by Second Sight, or through Sorcery Sense Projections, as well as by sight. The clarity necessary for aiming requires some highbandwidth sense, so most races can't target by sound, The Crimson Bat probably can, and Trolls using DarkSense certainly can, as both are acute enough for those species. Presumably, those dolphins and whales with nonfixed INTs can do the same.
Or at least that's my explanation. I remember reading about some experimental rules that did have aiming, and that it was rejected for game-mechanical reasons (made spell combat as much fun as multidimensional integrals). Perhaps there *is* an aiming skill, but that children learn it to 100% with their first, harmless, spells, which are forgotten once one gets the first "classical" spirit magic or sorcery spells. Thus, it can be ignored except when attacking children, or when playing the defending child.
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