1. Lower your weapon. Press Left CTRL 2x.
2. Beging to move. Test both Tactical movement and Standard movement. (Tactical movement has your arm set at your side. Press NUM ENTER to switch to Third Person view to observe.)
3. Try to look through optics. (Right Mouse Button) Once in Optics mode, switch back.
4. Your character will now be "auto-running" and you will be unable to stop it.
5. Press "V" to "step over." This stops your animation completely, giving you back full control.