If you yourself notice nothing but SoD vs HotA - that doesn't mean there is nothing else besides this line of discussion (the last two lines).
"But the two examples you provided suggest that no friendship existed anymore" — really? If I say there was a friendship, then there was; if you are unaware of examples where this bond between two people disappeared — then you're the lucky one..
1) in HotA 2) when a friendship between two players disappeared 3) as a result of one of them stream sniping or launching some program that gives an advantage and 4) are you absolutely sure that at the moment point 3 happened, this friendship existed on both sides
Is this exactly what you mean? (obviously, no need to tell the details of the situation, I just want a definitive Yes/No clarification)