That's the one.
I was making the run between Whiterun and Solitude and ran past a pair of giants that were also out for a stroll and noticed that their tattoos were glowing a faint redish hue
. I took note of my surroundings and noticed that both moons where in their full phase and were high in the sky, when I looked back at the giants they had stopped glowing but after a couple of steeps they resumed glowing in the dark.Once again I looked to the sky and a cloud had passed in-front of the moons which I assumed blocked the moon light and caused the glowing to stop, only to resume when the moons where back out 