To sum up, your idea that administrative penalties will only be pursued for minor injuries is biased.
National legislation opposes any form of intentional harm to the body of others. The infringer will be held criminally or administratively responsible according to the consequences of the injury.
If your lover's injury does not constitute a minor injury, then you must also pursue the other party's administrative responsibility in accordance with Article 43 of the "Public Security Administration Punishment Law".
Punishments should only be based on minor circumstances. In principle, they should be detained for not more than five days or fined not more than 500 yuan.
Just because the perpetrator’s behavior did not cause minor injuries to the victim does not mean that he should not be held administratively responsible.
This violates legislative principles.
As for the civil compensation part, given that the damage consequences of the other party may be relatively minor, the liability for compensation is smaller.
However, this does not mean that eardrum perforation is possible without a slap. At least the examination fee, transportation expenses to the medical institution and corresponding work loss expenses must be paid by the other party.