A lawyer was representing a client in a probate matter. The representation mostly occurred within the lawyer's home state, where the client also lived. One asset of the probated estate, however, was an account receivable from a debtor in a neighboring state; the matter was already the subject of pending contract litigation in that state. The lawyer filed a pro hac vice appearance in the neighboring state, and he traveled there to represent his client in the contract matter, which was ancillary to the probate matter in his home state. During the proceedings, the lawyer committed an act that constituted a violation of the ethical rules in his home state, but not in the neighboring state where he was appearing in a proceeding; the states had different rules in this regard. Could the lawyer be subject to discipline in his home state for violating its rules before a tribunal in the neighboring state