As luck would have it, a doctor happened to be there when he fainted.

他晕倒时幸好旁边正有一个医生。

《新英汉大辞典》

The room began to revolve, then he fainted.

屋子开始旋转，然后他就昏倒了。

youdao

When he fainted, his son bore him out of the room.

当他晕过去时，他儿子把他背到房间外面去。

youdao

Last month, he fainted while attending a conference in Ireland, on the day after Litvinenko died.

NPR: U.K. Investigators Visit Moscow in Litvinenko Probe

He drank too much champagne (after cutting the diamond) and then he fainted.

FORBES: The World's Largest Diamond And Other Record-Breaking Jewelry Moments

He fainted and took a 20-minute reprieve and was given oxygen.

BBC: Justin Bieber treated by doctors after O2 Arena concert