I am trying to understand what mundane characters see when a Magician casts an indirect combat spell.
Looking at the rules (core rulebook), I can find the following snippets (p. 283):
All indirect combat spells originate near the magician’s body (most magicians use their hands or eyes, but some use their feet for “power kicks” or emanate power from the entire body for a kind of an aura-throwing effect). The spell then is launched […] kind of like shooting a gun (in this case with bullets made of acid, or fire, or something equally unpleasant to be hit by).
And further down the same page:
Area indirect spells travel from the magician to the point of detonation and then go boom.
Now if a Magician casts for example Fireball on a group of people a bit down the road, what do they see before they are clouded in a ball of fire? Is there like a compact flame which travels to them? Or is it a colourful blob of energy which only at the target converts to fire? Or is it entirely invisible?