This is a new one. But I think it just goes to show that nearly anything
can cause such activity and so little is understood about the brain that
the medical community doesnt really know why stuff like this happens.

Possibly, if someone was just at the Simple Partial Stage (aura phase) of a
seizure onset either getting their attention to shift (like example above) ,
or distracting them, some types might be able to stop abruptly.
  I'd expect with some of the stronger types (complex partial or grand mal)
that once a person has passed that simple partial onset, that above wouldn't
work.   Since then, we're often in 'The Twilight Zone' and either won't hear
anyone (even someone yelling at us) or won't understand what they're saying
(or who they are).
   Under Julie's Idaho website under First aid for seizures, the stronger
seizure types say to guide a person away from danger or places they might
injure themselves, and talk to them calmly,  as the best way to bring them
out.   Most of the ones I had (Complex Partial) before they were controlled,
I had no memory of what I did or where I was while 'away'.    So I could
wake up on the floor,  strapped into a stretcher, or in the Hospital  (in
reverse order there as I got nearer to full control with medications).    I
expect the only ones that above would work with would be Simple Partial or
Absence? Seizures.   G./