When viewing through the binoculars, if you change your stance the character will:
- put away the binoculars
- pull out primary weapon
- change stance
- put away primary weapon
- pull out binoculars
You are also unable to change to any of the sub-stances when looking through the binoculars. (CTRL+W or CTRL+S etc)
You should be able to change stances without putting away the binoculars.