Yep. And they do what they believe they have to do. Even the wiki article on "Slain in the Spirit" notes that the people usually fall backwards and this is something that happens during public demonstrations.
If a person truly loses consciousness while standing up, the person falls forwards.
HEY! I knew that!
I learned it on M*A*S*H when Klinger was faking fainting spells to try and get out of the army...:lfao: That Klinger..he funny...he would try anything.