charliej47 wroteI ruled as such because when he started his "jump turn" he was in contact with the rubber and the turn is an extension of hie contact.
There's nothing in the rules about "extension of the contact." Rather than make up a rule about being in contact when he's obviously not, you're on more solid ground to explain it in terms of NOT being a legal disengagement.
Since it's not a legal disengagement, it's still governed by the rules concerning stepping and throwing to 1B, even though the pivot foot loses contact with the rubber.