According to Osho, inner transformation in a master's presence happens by 'healthy infection': the master's silent vibration entrains your being, like wellness you can catch. Simply being near shifts your wavelength; his presence plays the guitar of your soul, birthing sweetness and a first 'taste' of another state. This catalytic environment can transfigure you without techniques—dangerous if you're unwilling to be cured.
Being close to a true teacher makes you catch their goodness, so you start changing inside without forcing it.