Todd the wood junkie wrote:

Help me understand what the 'back side of the bit' means. Was this a
straight bit, or a rabbet bit? Are you saying the workpiece was
between the bit and the fence?

He means feeding the workpiece in the same direction as the rotation of
the bit, rather than into the cutting edge. In other words, on a
standard router table setup, he was feeding left to right instead of
right to left.