No, co-witnessing does not mean using your iron sights and your optic at the same time.
Cowitness simply means your optic is mounted on the same plane as your iron sights, allowing you to aim through your optic when using your iron sights.
So, in a SHTF situation, when your EoTech batteries die and you don't have the time to remove it from your rail, you can flip up your iron sights and see them through your optic glass.....
Of course you don't turn your EoTech on and try to line up the hologram and the irons...good grief, but I guess since I didn't specifically say use folding sights, which I figured was so common-sense that it didn't need to be said, that's what did me in huh?
:roll: