There are stories of Padmasambhava and his students having debating and supernormal power contests with the Bonpos, in which the Bonpos were defeated.
I think at some stage elements of Buddhism were eventually incorporated into Bon, which is still practiced.
" I am my own refuge, I am my own protector. Nobody can actually give me protection. I must help myself by clearly understanding what I have to take up and what I have to get rid of. I have to find this out myself and then do it, and that the true practice of Dharma. It is through the practice of Dharma that I create the causes and conditions for my own happiness and for achieving wisdom, compassion, and the ability to help others."