This section of the sky had such a vivid deep red color that it seemed almost angry. Though I have heard the saying about a red sky meaning sailors will be fine the next morning. Our time on Beaver Island is ending in a little over a week...can't believe how fast the summer and early fall have flown by.
It does look angry but as you mentioned, "red at night, sailor's delight'. Not sure what that is based on but there is often a little bit of truth in those old sayings.