You know, Klingons, for all the cheese they got saddled with over the decades, were sometimes given some truly amazing moments like that one. They're this hyper macho, warrior driven and hide-bound culture, but they value friendship in a beautiful way. They really get loyalty to a friend in a way that no other in-universe culture does.
Klingons are like those ancient warrior tribes that seemed barbaric at surface level when historians first studied them, but were found to be a lot more rooted in community, duty and survival once you get to know their ways. They are a product of surviving in the environment they did