I'm pretty sure to have read, a full bladder is not strange to cases of death by hypothermia. I just can't find where I read this. bang1
I discussed the problem with M.D. Vasil Nikolchev, Head of the Forensic Department in Kyustendil, Bulgaria. He made the autopsy of the woman who was killed by a tree that fell on top of her tent on 7/7/2020.
(https://dyatlovpass.com/resources/340/gallery/Fallen-tree-incident-Bulgaria.jpg)
Woman (29) dead, boyfriend walked away with a minor injury and a fright
Dr. Nikolchev agreed that the common perception is for light colored blood to be found in frozen corpses, but the blood can be dark, too. And the blood clots may dissolve during thawing. Then he handed me the following scientific paper and said "We all (the MD) keep looking for answers in books till the last day of our practice."
https://dyatlovpass.com/resources/340/Hypothermia.pdf (https://dyatlovpass.com/resources/340/Hypothermia.pdf)
On p. 10 it says how many autopsies are taken in consideration - 3265. Many parameters are taken into account - age, gender, life style, health, latitude, climate, alcohol, genetics, I can even remember all you are welcome to leaf through t, sorry that it is in Bulgarian but I am sure you can find a way to translate it if it comes to that. On page 28 there is a table that shows what are the % for bright/scarlet blood - 49%. Right in the middle.
I asked Dr. Nikolchev for his opinion on refreezing the bodies: All kinds of things can happen when a body is thawed - change of color, rapid decomposition and all kinds of fluids can start coming out. He wasn't sure about defecation. Dr. Nikolchev said that in his 29 year practice he had only seen hanged people soil themselves, but not all of them do it. Common knowledge is that people dying from hypothermia have more urine in their bladder. They just do not urinate. There is no explanation about that, they just don't. But it is not a rule. The MD was kind of upset because he saw that I am expecting more certainty in his answers. He said that every illness, every condition, everything concerning the body can develop atypically. The coroner merely records an observation. Certain things are more of a symptom for further exploration e.g. discoloration means poisoning - make a test for certain poison.
Foam coming from the mouth and nose can happen when the heart stops, too. It is not indicative of a certain cause of death.