I haven't anything against the Potters, unless that annoying Gryffindor one counts. But you know what school is like. Evans, though? I don't know the name. Do you mean to say that you're a mudblood?
They cannot be in two places at once, which means that the time-travel magic is a clever sort, and time may pass differently in Preya.
I think it's deeper than that. Charms, of a sort, but with extremely advanced magical theory. Perhaps a charmed artefact - although I haven't found one.