Possible Clues:

• Ran into someone with friend by mistake
• Can't dice chops for friend inadvertently
• By chance I had to interrupt speech by friend
• Stress about identification friend produces by mistake
• Inadvertently, by chance
• By chance, stress colleague grabbing passport?
• Heads of American classified counter intelligence damage friendly country without meaning to
• Friend follows chance unwittingly
• By chance, one new score's interrupted by detectives
• I had bumped into Mark, someone on the same side, by chance