Ngesikhathi sokusebenza okude, amaketanga okudonsa ikhebula angase aphuke ngezikhathi ezithile ngenxa yokunyakaza kwawo okuphindaphindayo, kanye nesisindo sekhebula nepayipi likawoyela ngaphakathi kwegumbi. Amanye amakhasimende angase abuze ukuthi angakugwema kanjani ukuphuka ngesikhathi sokusebenza kwamaketanga okudonsa amakhebula ebangeni elide.