Hummmmm? Lee had no part in the First Battle of Bull Run. He was down in South Carolina and Georgia then overseeing coastal defenses. At First Bull Run, P.T.G. Beauregard and Joseph E. Johnson were in command of the Confederate troops.
Lee was the first commander of the Confederate forces but was somewhat discredited after the Confederate failures in western Virginia. His plan may have been used. He, of course, did not get his chance at active command until Joe Johnston was wounded during the Peninsula Campaign.
And, there stood Jackson like a stonewall....