Problems triple booting (Mac, Windows, and Tails on usb)

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Im having troubles booting TAILS (built on linux) from USB on my Mac. 
I have a windows partition setup on the same drive as my Mac os (mavericks).  I also have rEFInd setup.  When I reboot and enter rEFInd my Mac, windows, and Legacy USB options appear.  I select the usb option and windows boots instead.  I need to figure out how to boot from the flash drive and stop the Windows boot loader from taking over.  Mac os boots normal however.
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