Interrupt seduction if the hero gets moved away from the seducer, or
if both of them move to another level. Loss of levitation can drop
the hero onto a trap which sends him/her somewhere else, but seduction
was continuing as if nothing had happened. In theory it could continue
despite level change because succubus and incubus are level followers,
but there's no way of knowing whether seducer and victim will arrive
next to each other until they get delivered and that doesn't happen
until long after the attack needs to finish.
I don't think theft has the same problem because it is a multi-turn
activity operating on one item at a time, but I didn't check it out.
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