Again, I apologize for posting here but I am going to add information for the sake of topic and for public awareness:
I analyzed the videos and noticed that - to perform this bug - he has to switch to bare hands then switch back to sniper to stand up. Hence the bug can be avoided(by not switching weapons) so as a result, the players, if they are willing to abide the rules, can not hinder the fairness of game play if they ever come across it and get confused.
I didn't bother to make a topic because it is a waste of FTP so I hope admins understand me.