signcutter,
I assume from your comment "go to idle and visit someone" means get out of the aircraft while it is at idle.
Read the RFM for the B3 and you may find a statement that precludes this.
There has been a fairly big bunfight with a certain NAA over this point as the RFM In the B3 and B4 is different from the "analog" 350's.
I am not 100% sure but there is something on the 2B, 2B1's where with an electrical failure the engine defaults to FLIGHT. I saw someone wheel a B3 out and not check that the battery was connected. Performed a ground power start and on disconnection of the GPU it ran up to FLIGHT!
This what I was told after the surprised look on certain faces. Might be worth checking into.