Its probably a matter of perspective. Remember that Insurgent you shot at that last night mission on Chernarus? The guy who was standing up between two bushes-- he was looking at you too! Mighty good shot there. No?
His mate was probably shaking his head too.
As a leader of AI you must realize that your AI teammates take following your position quite seriously. If you are constantly on the move, your AI will attempt to keep up with you. They'll do so to the extent that they may not spot the enemy. Sometimes the best thing to do is just to go prone and let the situation develop.