You didn't see anything or a force because it is a TV show, and TV shows are edited. You don't ever see the set-ups. In terms of magic presentation, this is a good lesson for new magicians to learn. What you are describing is an illusion that is created by his patter and presentation. Look up the trick "Imagine" By G. This is a perfect example of how patter and presentation can be used to achieve what you saw Blaine do. Basically, you shape the audience's perception of what really happened.