that's how the image panoramas are taken. Initially it is supposed to spin at ~4-6 rpm, then the rate will increase to as much as 10+ at mid altitudes, then should decrease to less than 1 rpm close to the surface.

I’m taking this information from a 1997 ESA publication – Huygens: Science, Payload and Mission. I assume the mission profile hasn't changed and the graphs and charts are still valid.

Full DISR panoramas consisting of 36 images are to be taken at these nominal altitudes:
160 km, 143, 114, 83, 61, 46, 39, 34, 28, 22, 16, 14, 11, 8, 5 . Actual mileage (kilometerage ?) may vary. :-)

In addition to these 15 panoramas, there will be 33 non-image cycles down to 20 km, then 20 3-image sets + spectra between 3000 to 400 m, 2 high res images between 400 and 200 m, 18 spectra with the lamp below 200 m, and finally, up to 83 3-images ets and 92 spectra sets from the surface,