Why might an unknowing bystander start CPR on a patient having a seizure?

An unknowing bystander might start CPR on a patient having a seizure because the patient may display a short period of apnea, where breathing ceases temporarily. During a seizure, especially in the postictal state or as the seizure is ending, a patient may stop breathing or breathe irregularly, which can lead onlookers to believe that the patient is in distress or unresponsive. This could prompt the bystander to initiate CPR as a life-saving measure, especially if they are unsure about the nature of the situation and the patient's condition appears critical. Understanding the potential for apnea during a seizure underlines the importance of bystanders assessing the patient's breathing and responsiveness before starting CPR.