If I had studs on yesterday I wouldn't have even given that icy patch a second look or s second thought. It would have been a non-event. I've ridden over stuff like that countless times on studded tires. They work as advertised.
Yeah, this warming/cooling trend around the freezing mark is the problem lately. Much the same today, but I've got the studs today. Put a few flurries during the overnight period and it's even more treacherous as you can even see where the slick spots are.
Careful out there!