From the lack of any more information, I think, although I could be wrong, that the pair in question play standard weak two bids, and that this player chose to make this bid because he was in third seat. I think answers from this perspective would be most helpful for the OP. My only comment at this point is that this pair may not have discussed anything related to this, but there may be some partnership tendencies that partner of this hand may know, and should disclose.