Based on the context and the answer, generate a question. 

Context: We turned around at the station , along Bakers Road , into Belmont Road , and then just as we turned to the bus stops outside The Pavilions , one of our passengers fell to the floor , and suffered a seizure . A combination of a very professional driver ( following accident procedure to the full ) and a prompt arrival of the Ambulance service meant that after a little under half an hour , we were able to go , with all passengers on board . Now , this , along with further traffic , meant that we were 35 minutes down at the next timing point , Denham .

Answer:

Someone on the bus suffered a seizure .



Why did the bus have to make an unexpected stop ?