It is possible for a grandmaster to defeat a novice,my father used to love wrestling when he was a young man ,he told me he went to a UK wrestling club for the first time and he faced a bald headed teacher , he held my father so well that my Dad even as a very strong young man could not escape.
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/sanatan-sikhism/37400-only-living-master-dying-martial-arts.html
A Guru/teacher who teaches you the fine arts or martial arts should always be respected, infact in martial arts the first thing a student learns is to respect his teacher.
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/showthread.php?t=37400
If you think about it a teacher can only gain a student if he impresses him ,
if the student can beat the master at first attempt, then no teacher would gain a student and there would be no need for the word master in the english language.
Having said that though it this article is all about the past,and my dad always says the past is a 'Bounced Cheque'(what he means is you can't do much with it,I like to think of it as a cheque you have cashed and spent).He also says that the future is a 'Cheque to be Banked or a Promise of Payment',and that your present is your 'Cash in the Hand.'