Yeah I don't think he's lying he seemed genuinely torn up by having left Alonzo behind, but I do think that part of his being torn up is that he hasn't come to grips with is that the party was full of racists, that he didn't notice cause PRIVILEGE, which even the other guy said he knew and I suspect is why he bugged out, he said the whole hick country music shitkicker party wasn't their groups scene. My niece was left by a huge group of friends in a college town of a college she didn't go to while wasted drunk, she got beat up, and I was hella HELLA pissed but only at the one friend I felt shouldn't have passed the buck to other less loyal friends to "watch" her at the bar. I do wonder why Justin didn't speak directly to Adam, telephone isn't a great way to make sure your black friend in a Sundown Town makes it out alive. Having said that I suspect whoever snatched Alonzo did so before Adam/this other guy left. But when you are drunk you want to do literally the easiest thing and the easiest thing was tell yourself he found a way home with someone else.