With reference to commands from the crew being responded to immediately. Years ago we had aHEMS helipad right next to the airport beacon pole/ tower. Bad idea to begin with but such it was. One day one of the pilots was launching and had started a drift that would certainly have ended in a sad way but for a flight nurse who said one word. That word was "pole!!". They were probably less than a foot away when he responded. The pilot was so shaken by this lapse that he set it back down to regain some composure before moving on. Nobody at that base was into the pilot versus med crew baloney you so often hear about.