I spoke with the young EMTs yesterday who are being trained in my corp. They told me about the call they did and how chaotic it was because it involved a crash and NYPD officer so it was a high profile and sensitive at the same time. I just asked them who controlled the scene. They said that everything was going with the flow and mentions few snafus along the way. So basically what they told me is that scene was controling them. This is where I stoped them... I know that it is easier said than done but there must be someone in control of the situation. And some people are leaders and some are followers but the follower must be ready to pick up the ball when leader fails. They told me that there were many different agencies on scene and everyone wanted a piece. Now since it wasnt a crime scene or a fire scene, medical services are in charge of the patient. So they should have been in charge and get their point accross.
Your friend acted with clear mind that was fouled by survival. I never been under the mortar attack and don't know how long they last. Chances of getting hit by a mortat are pretty much all the same when you are in the open field since it is like playing the Lotto. Even running away from the attack would not have helped him if the plane with that much fuel exploded. He took cover from shnarpel and that's they best that he could do at the time. Unless situation involved a bunker that was the same distance away as the plane he used for cover. But he was clearly in charge of the situation and did the right thing at the time.
It helps when you have a clear mind and make up a plan (even if not the best one) and carry it out. Since after all its done it's easier to say that I did something instead of blaming yourself for doing nothing. Now if that was me hiding in fueled plane during mortar attack I'm sure my friend would make a Polish joke out of it. So in conclussion I rather be proactive and hide in a plane than stand in the middle of the field with my pants full sucking on a thumb.