Do obstacle abilities work until the moment they are defeated?
From the way I read the rules you will be able to use colorless as in the apply damage step it lists defeating an enemy and it does not state you have to apply all damage before this. Also it should be noted that some defeat effects also will provide bonus damage which would also lead me to believe that you can do more damage after defeating an obstacle.


  Defeating an Obstacle
  When you clear the last (far-right) level of an obstacle’s damage
  track, you defeat it. If the obstacle has a defeated ability,
  apply that effect.