Continuing the discussion from Gods and demons japans:
I saw this on one of the other posts. Though it doesn’t have much information on it. I tried doing some google searches and didn’t turn up much.
On the topic of the vision itself, did you get any impressions from the demon? Fear? Anger? I will say that in my experience you can “ping” an entity as long as you have a fresh memory of the appearance of it and a memory of the event. You could try to call out to it and see if it answers. Though, I’m definitely not the safest magician out there sometimes (missing those “street smarts” some may say).