Possible Clues:

• How one responds. One gives an encore, it seems
• Plays this a second time?
• One plays again, perhaps, with the broken crates
• Looks shocked, e.g.
• Plays again for traces of this
• Shows surprise, perhaps
• Traces of how one plays this a second time, perhaps
• Is this how one responds to traces of this mixture?
• Flinches, for example
• Does a knee jerk, e.g.