Whether or not A or B

During Terry's fight with "Hush," it is revealed that he is not only capable of matching Terry, but is also aware it's not Bruce Wayne. "Hush" reveals his plan while regarding Terry as an 'imposter', and states he'll 'orphan' Batman all over again by killing Batman's rogues gallery. "Hush" escapes, leaving Terry to decide whether or not to pursue him or rescue Calendar Man, who is bound with a bomb attached to him. Choosing the latter, Terry to arrive too late as a bomb detonates, killing Day.

I think I can only use either "whether or not", "whether A or B" or "whether A, B or C."
So, I'd like to know whether I can use "whether or not A or B" as in my example.
Thank you in advance for your help.