There are a number of different types of seizure, if someone has a complex seizure or a tonic clonic seizure they will call to the ground or be on the ground jerking and twitching. They will not respond to you and you may see their eyes roll back.
When they are having a seizure:
Whrn they come round put them in the recovery position or keep them sitting down until they are alert. Check them for any injuries
You should call an ambulance if: