burning bush and medium

[Bushwhacker]

A text talking about the main actress for most of the movies of a helmer says of this thespian that she was "his burning bush and medium."

Please, what does this expression mean?

Thank You

[bhaisahab]

A text talking about the main actress for most of the movies of a helmer says of this thespian that she was "his burning bush and medium."

Please, what does this expression mean?

Thank You

Who or what is "a helmer", if it is a film maker, a person, then it means she was his inspiration, a revelation.