It would be chilling to me too, but I’ve been at a party where that very thing happened. I was 17 or 18, and we were young and stupid and there was pot. And an older guy in his early twenties went to the door cool as a cucumber, apologized that the music was loud. We turned the music down. I suppose there was no probable cause for the cops to come inside, it was simply loud music.
But… No way the cops could not smell the pot smoke coming out of the front door, It was thick in there. The cops didn’t want to fool with it and the guy apologizing gave them an excuse to blow it off. So they left.
I think this was similar, the cops just wanted the music turned down so they could get on their way. The boys did not look stumbling drunk, and the girl who answered the door was ok.
JMO