I like the verb that de Camp coined for forward time travel—vanwinkling—but when the
hero, De Witt, chases Hedges back in time, they start changing things and everyone (including
them) remembers both the old time and the new. It’s beyond me to grok that form of time
travel, but I give credit for creativity.
The problem of backward-jumping has not hitherto been solved. It involves an obvious
paradox. If I go back and slay my own grandfather, what becomes of me?