Temporal Afterimage

You channel temporal energy into your eyes momentarily causing your perception of time to blur. All objects and creatures begin to produce afterimages in your eyes, and by focusing on a target you can will it into existence  for a few seconds (1 round or beginning of your next turn).

This after image repeats exactly what the target does, copying any attacks, ability's, or magic items they use (the effects of the magic item become doubled at the DM’s discretion). As well as any spell 4th level or lower. Any dice rolls the target does are copied to the afterimage and it doesn’t need to roll. 

The afterimage is just the target momentarily offset in time, so the damage the afterimage would take is not applied to the target, but if the target were to get knocked unconscious so would the afterimage. 

If it were to interact with a physical object such as picking up a sword, both the target and afterimage would look like they are holding a sword and can attack with it but if they were to both drop their swords there would still only be one sword.