I recall one school not allowing students who attempt to transfer to participate in OCI. I don't remember which school, anyone else remember?
you must be talking about OCI for 2L. Doesn't OCI for 2L take place after you know whether you have been accepted or rejected for a transfer? So I don't see why a school would prevent you from interviewing if you are unsuccessful in transferring. I have heard of cases where you are successful in transferring, in which case you would not be able to interview at your former school. I guess in those cases where OCI overlaps with transfer decisions, it would make sense for the current school to not want you to interview, because you could be gone in the fall. I wouldn't call this "retaliation" though.
Yes, by OCI I meant 2L OCI, but I am not talking about missing the OCI at your new school. The situation I recall was that if a student requested their transcript be sent to a new school or LSAC, they were unable to place bids for their current school's OCI. 2L OCI bidding takes place in the summer, so the school cut off people attempting to transfer during that summer, regardless of whether they were successful or not, I believe. But again, I don't remember which school was doing this and I don't think that is very common.