This occured also in my Philips ML 160W from 2005 in the last years. But more common in this lamp.
When my HWL lamp hot restrike after several seconds of negative glows it restrike smooth, without any flickering (Unlike most SBMV of several LG members). You can see this hot restrike here (Move to 4:25).
Sometimes it even strikes suddenly from nothing, without the negative glow first, like the penning start HPS lamps.
Why this is happening.

The "glow discharge" (discharge with electrons torn from the cathodes either by the electrical field, or by ion bombardment) is usually called the discharge between the main electrodes, but when they are still cold (= below the temperature needed for thermionic electron emission). The high power dissipation from the heavy ion bombardment heat up the electrodes, so the discharge transition into an arc (= discharge with electrons emitted by the thermionic emission) With HID's the glow phase take less than a second, but with incandescent ballasted lamps it is way shorter, as the low resistance of the cold filament cause the current, so the bombardment electrode heating power to be way higher, so they reach the thermionic emission way faster than when operated with more constant current gear (in fact the electrodes heat up faster than the filament - mainly because the voltage distribution in the lamp).

What is glowing there is the tiny discharge between the auxiliary (starting) probe and main electrode.
Because the electrodes are already cold (= no thermionic emission) and there is still quite high pressure, the 230V mains is just insufficient to create a discharge across the main electrodes, while it was just sufficient to cause the discharge from the auxiliary.
And sometimes the conditions are so, the starting probe need the pressure to drop further in order to break down, so then as that happen, the discharge immediately move between the main ones.