What you hear regarding officers yelling conflicting commands are excited / inexperienced / inadequately trained police officers experiencing a substantial adrenalin rush. Want to calm them down when guns are pointed your way? The easiest way is to slowly comply and avoid any furtive movements. If there are conflicting commands, loudly yell “Which one is it? Do I get down or do I put my hands up?” Yell it loud enough for it to be heard on video and for bystanders to hear. Otherwise it is possible to put you hands up while lying on your stomach if appropriately motivated.