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 In Manual exposure mode, if Auto ISO is set, then the camera changes
the ISO. If ISO is set to something fixed, then the camera modifies the
shutter speed.
 When you use a flash, the f/stop and shutter speed remain constant
across all bracketed images – it is the flash burst that is adjusted. And,
because the camera designers were afraid that the flash wouldn’t be
able to recycle in time, when you’re bracketing with flash the camera
automatically switches to Bracketing – Single mode (even if you had
specifically told it to shoot Bracketing – Continuous).

5.7.7 WHITE BALANCE BRACKETING
Just as it’s tough to assess whether the exposure is perfect out
in the field (driving the need for exposure bracketing), so too
can you sometimes be unsure about the White Balance setting. White
Balance Bracketing will take ONE image and store it three different ways:
“Normal” (the way the camera would normally shoot the image), a little on
the blue side, and a little on the yellow side, as shown in Figure 5-12.

Figure 5-12: White Balance Bracketing Examples. Top row is “Low bracketing” (Normal
 blueish  yellowish]; and the bottom row is “High Bracketing”. The difference is
“High bracketing” will shift the color twice as much in either direction.