Laws 30 and 31, Pass or Bid out of rotation
Both laws include the phrase "at his LHO's turn to call if the offender has not previously called". In simple English, one might think that "previously" simply means "at any time before now on this board", i.e. the condition could be satisfied only if LHO were dealer. But if that were the case, the rectification - treatment as a change of call, Law 25 - is difficult to understand.
It would be really helpful please to have some clarification and especially an example auction where the offender bids at his LHO's turn to call, the offender not having previously called.
Many thanks !