when a mage casts a spell that isn't visually obvious, how and what are people perceiving if they are a mundane or just not using astral perception at the time?
bit of a lore question, but when people perceive someone using magic, what are they actually seeing? Unlike in something like D&D, Shadowrun mages don't have to make hand gestures or say magic words, so how does someone who isn't actively using astral perception notice when someone is using magic that isn't something visually obvious like a fireball?