1.open editor
2.insert rifleman
3.preview
4.open DIRECTLY the map
5.while the map is open, start to walk (which is realistic, it is possible to walk and watch a map...)
6.still while walking ("move forward" key), close the map and DON'T release the walking key!
7.after the map has been closed, still while walking, toggle to the optic ("optics" key)
8.you are now stucked in walking mode, you can't stop!