Fallback values when poweroff

Is it normal to get unusual fallback values from BlueOS when powering off the Raspberry Pi through BlueOS? Occasionally, I’ve noticed the thrusters briefly spin—sometimes just a little, and other times they momentarily hit max RPM.

Yesterday, I powered off the Raspberry Pi via BlueOS while the ROV was still floating, and for a split second, the thrusters went full throttle. Standing next to it, I instantly got an unexpected ‘washing machine’ hairstyle and a free surprise shower. :ocean::dash::umbrella:

Or is it perhaps an intentional feature to dry the thrusters using centrifugal force, assuming the ROV is expected to be out of the water during power-off?