I don't know if I'd call it a regurge - it sounds like he didn't get it positioned right and hacked it back up. When I think regurge I picture him totally swallowing it, beginning to go through digestion and then "vomiting" it back up.
My ackies will do the same thing if they don't squish a cricket or roach down just right or if they don't subdue an insect before trying to swallow it - they'll get it stuck in their gullet and just kind of "gag" it back up.