Perhaps with 0bama a no show Jablonski was afraid any evidence he would submit would be considered direct testimony and be put in a purjury trap . This happened during the hearing to Orly when she began making statements ,, the judge stopped her and asked her if she were in fact starting to testify . She was then sworn in and then testified to the evidence or statements she presented .
With Orly it sounds like a simple mistake. She didn’t intend to present non-sworn “testimony” — she was just too eager to get going. And she didn’t mind the judge correcting the oversight and swearing her in as a witness.
But you may be right, heck if Jaw-bluster was going to permit Obama to be sworn!