To be sure, I think Murder 1 has to show that it was premeditated, doesn’t it? Murder 1 charges here would not be easy to prove unless there was proof that Dunn intended to commit murder before the argument over the music started.
Although I'm not a lawyer what you say rings familiar.But one can "premeditate" in a second or two.My understanding is that the evidence strongly suggests that the shooter "meditated" for a minute or more.