It has? Did not know that.. so the orders have been found? Of course Von Runstedt ordered the panzers to halt.. he was in command. Now was he influenced by Hitlers views... or someone elses? Well that is the real question that we will never get answered, because tactically it was a brain dead move, one that I can not see Von Runstedt or any seasoned general making. Add to that, the lack of air attacks (relatively speaking) and one has to question who really gave the order... Hitler, a corporal that made bad strategic decisions over and over, or seasoned generals who tried to stop him?
No, and once again you are showing just how little you know on the subject.
It was not a brain dead move like you have claimed, you are speaking from the position of hindsight and ignoring the realities of the situation.
When the Allied counterattack at Arras on May 21st occurred, it caught the lead German Panzer formations off guard. They had outrun their own infantry support (since the vast majority of German infantry were not mechanized, so they had to walk and have horses carry their supplies), and operating tanks without infantry is a cardinal sin. Rommel himself claimed he had been attacked by "hundreds of tanks", even though the actual number was 74. It never the less highlighted the exposure of the German armor, and their precarious situation; having advanced far faster than expected, they were running out of fuel and ammunition, some units had suffered 50% losses, and after two weeks of non-stop fighting the Panzer crews were exhausted.
It was General Ewald von Kleist, commanding Panzer Group Kleist, who originally requested the halt and it was approved by Rundstedt, who in his own personal journal at the time wrote his agreement, and later explained to Hitler the justification of the decision; the land around Dunkirk was marshy and full of canals, poor terrain for tanks anyway, and Hitler, having fought there during WWI, confirmed this and agreed to the halt. It was in fact little more than a rubber stamp.
Come on.. the RAF had the same problem that the Germans would have later on when bombing the UK.... the fighters did not have enough fuel to stay very long over the beaches. They were easy targets for the Germans, and the British were preparing for invasion, where the only defence they had (other than the channel) was the RAF.. so the planes that were sent over, were at best token moral boosters.
So yes the RAF flew sorties over the beaches, but lets be clear here... the Germans controlled the airspace and could have bombed the 400k troops to death if they wanted too and the RAF could have done nothing about it.
You are once again showing how little you know. Over the nine days of Operation Dynamo, the RAF flew 171 reconnaissance, 651 bombing and 2,739 fighter sorties, shooting down 206 Luftwaffe aircraft. The RAF sharply contested the Luftwaffe over Dunkirk.