the wrong way to use healing magic react to

Well, it could result in a distortion of the magical balance in the story's world. Healing magic is often part of a larger magical ecosystem in fictional settings. When it's misused, it might tip that balance. Say, if it's overused in the wrong way, it could deplete the natural magical resources that are meant to be conserved for other types of magic. This could then lead to a shortage of magic for other important functions like protection spells or divination. Also, the wrong use might cause a corruption of the magic itself within the novel's lore. It could mutate into a form that is unrecognizable and uncontrollable, causing all sorts of unpredictable and dangerous effects.

One consequence could be that it may cause unexpected side effects on the patient. For example, instead of healing a wound, it might accelerate the spread of an infection if used wrongly.

One example could be using the wrong incantation. If the incantation for a healing spell is mispronounced, it might not work as intended or could even have negative effects.

They might notice that the patient's condition is not improving but getting worse. If they are trying to heal someone, but instead the person's pain increases or their wounds seem to fester more, that's a clear sign they are using the magic wrong.

Perhaps using the wrong incantations or gestures. In the novel, the proper form of using healing magic might be very specific. If the user gets these wrong, it could lead to ineffective healing or even harmful consequences. For example, a wrong gesture might redirect the magic to the wrong part of the body, or an incorrect incantation could change the nature of the magic from healing to something else entirely.

There might be a mentor figure in the novel. This person could be someone who is supposed to guide the main character in using the healing magic correctly but for some reason, the main character doesn't listen and continues to use it the wrong way.

Perhaps misidentifying the types of injuries that the healing magic can effectively treat. In the novel, it might be shown that some characters use it on fatal wounds that are beyond its capacity, thinking it can cure everything.

It creates conflict. When the characters use healing magic the wrong way, it often leads to new problems that need to be resolved. This drives the story forward as other characters have to step in to fix the mess.

In 'the wrong way to use healing magic light novel', the main character is likely someone who discovers the healing magic but doesn't fully understand it and thus uses it wrongly. There could be antagonists as well. These antagonists might be those who are against the wrong use of magic for various reasons, perhaps they are the protectors of the correct magic usage. There may also be characters like family members of the main character who are affected by the wrong use of magic and play important roles in the story.

It could be related to using healing magic on the wrong targets. In the nack novel, perhaps there are rules about who can be healed and if these are violated, it's the wrong way. Say, using it on an enemy who has dark magic that corrupts the healing magic.