Have a look at this video.
You can see one of the fairings stabilizing itself with a thruster as it comes down (a span of time around 04:00
. Start watching after 02:44
when the four-minute mark)2nd stage engine ignites.
It looks like the bright spot at the top is the 1st stage, using cold gas thrusters, and the bright one at the bottom is the 2nd stage continuing.
The two smaller spots are the fairing halves, and the upper one shows a cold gas thruster plume in the center panel:
These are cropped screenshots from the video: