Hypnosis is not a steady state system....in other words it's not like an on/off switch. It's more a continuum where people drift throughout different states and depths of state within a single session. As such, it is not uncommon for someone to move, or smile, or emerge completely from hypnosis at various times only to re-enter the trance again a few minutes later. Hope this explains the smile. I assure you, no one is acting. All the best, Anthony