It’s clear that in Potterverse, there are at least four inputs to a spell: wand, gesture, incantation, and state of mind of caster. Killing Curse and Patronus, for instance, are quite clearly dependent on state of mind. Transfiguration also depends on state of mind, and I don’t recall any indication that there is any modification of the gesture or incantation depending on what transfiguration one intends to perform; that is determined entirely by intent. I think that it is reasonable to assume that, just as the Transfiguration spell is a “Do the transfiguration I’m thinking of” spell, the Finite Incantum spell is a “End the spell (or class of spells) I’m thinking of” spell.
“End the spell (or class of spells) I’m thinking of” spell.
This would make the most sense, of course. But remember that this thread started from the idea “what if Dumbledore mass-Finites”, i.e. without knowing what spell he was cancelling. This might work if Finite is smart enough to identify a class like “unknown spells that entered the room together with Harry in this general area”, but that’s stretching it a bit.
Also, though that wasn’t my original point, it still has the risk of very dangerous effects. E.g., if Harry had used a 1 ton stone instead of his father’s, for some reason. Or if someone else placed a dangerous transfigured item on Harry.
By the way, I just had an idea: the reason you shouldn’t transfigure living things is that they get sick and die after turning back (presumably due to DNA damage and protein denaturation, basically approximating radiation exposure). Trolls are dangerous because they self-transfigure into themselves. Now, imagine you’re a wizard strong enough to transfigure a troll, say into a gemstone on your ring. While transfigured the troll shouldn’t be able to fix itself (since it’s a stone). It might even pass most magic wards. But when you turn it back, the troll should repair itself almost instantly, showing no signs of transfiguration sickness.
It’s clear that in Potterverse, there are at least four inputs to a spell: wand, gesture, incantation, and state of mind of caster. Killing Curse and Patronus, for instance, are quite clearly dependent on state of mind. Transfiguration also depends on state of mind, and I don’t recall any indication that there is any modification of the gesture or incantation depending on what transfiguration one intends to perform; that is determined entirely by intent. I think that it is reasonable to assume that, just as the Transfiguration spell is a “Do the transfiguration I’m thinking of” spell, the Finite Incantum spell is a “End the spell (or class of spells) I’m thinking of” spell.
This would make the most sense, of course. But remember that this thread started from the idea “what if Dumbledore mass-Finites”, i.e. without knowing what spell he was cancelling. This might work if Finite is smart enough to identify a class like “unknown spells that entered the room together with Harry in this general area”, but that’s stretching it a bit.
Also, though that wasn’t my original point, it still has the risk of very dangerous effects. E.g., if Harry had used a 1 ton stone instead of his father’s, for some reason. Or if someone else placed a dangerous transfigured item on Harry.
By the way, I just had an idea: the reason you shouldn’t transfigure living things is that they get sick and die after turning back (presumably due to DNA damage and protein denaturation, basically approximating radiation exposure). Trolls are dangerous because they self-transfigure into themselves. Now, imagine you’re a wizard strong enough to transfigure a troll, say into a gemstone on your ring. While transfigured the troll shouldn’t be able to fix itself (since it’s a stone). It might even pass most magic wards. But when you turn it back, the troll should repair itself almost instantly, showing no signs of transfiguration sickness.