Euonymus carnosus fall color

Today was bleak but there are spots of color here and there throught the Collection.This plant is one of a grove; its seven siblings are pretty much defoliated. I can't begin to explain it. So far as I recall they moved at roughly equal pace last fall so who knows what's going on. The biological world is so incredibly complex we watch things like this without a clue as to the explanation At least I do.