The Bride Wore Blood, Alan's summation

From season 3, ep 17. It's the episode that starts with a bride running through a courthouse covered in blood and carrying the bloody weapon. For his summation, Alan proclaims that his client is innocent and that he will produce the real murderer. He sends Clarence out of the courtroom to bring her in. After a long pause he admits that no one is there, but says to the jury that if anyone looked at the door, then they must think that someone else possible coul have done it and that is reasonable doubt! WTF?
Normally Alan gives outstanding summations, but this one was illogical tripe. It makes no sense at all. Super ninjas from mars could have carried out the crime, but not proving that they didn't is not reasonable doubt. I hope swarmy defence lawyers don't try this in real life, and I doubly hope that the jury never buys it.