Depending on the situation I could lie about it succeeding, go forward as if it didn't matter, use a back up technique, take the miss and admit i am not perfect

Depending on the situation I could lie about it succeeding, go forward as if it didn't matter, use a back up technique, take the miss and admit i am not perfect or do it on the full audience all at once to make sure it mostly works (you will observe some of the above if you go see Derren's stage show several times).