Did anyone else encountered problem in Li Deng's fortress with Lucky's Colt 1911?

In the scene where Lucky should shoot two venomous snakes either I am doing repeatedly something wrong or there is a bug there. Equipped Lucky's Colt in inventory but action cursor still shows bare hand instead of reticle!

THX

Edit: Eh! Never mind, the problem was on my side. After those Years i forgot You have to be holding RMB to activate the Targetting cursor instead of hand...