What decides the classification
States define and grade these offenses differently, and the grading generally turns on what is alleged about the object involved, the injury, and the intent. What counts as a dangerous or deadly instrument is broader than most people expect: ordinary items have been charged this way, so nothing resembling a weapon in the usual sense has to be present. Because the definitions differ so much, conduct charged one way in one state can look unrecognizable in another. This is also why the specific subsection on the charging document matters more than the name of the offense.
Why the label matters beyond this case
A felony conviction reaches well past whatever the sentence is. Depending on the state it can affect firearms, voting, professional and occupational licensing, housing applications, and ordinary employment background checks for a very long time. For people who are not citizens, certain convictions carry immigration consequences that should be reviewed with counsel before any resolution is agreed to rather than afterward. Relief such as sealing or expungement exists in some states and not others, and it is usually narrower than people assume, so the classification is worth contesting on its own.
What we look at first
We start with the charging document and the exact subsection, then compare it against the medical evidence for what injury is actually alleged. We look at whether the characterization of the object is contestable, whether self-defense or defense of another is genuinely in the picture, and whether the account of the complaining witness has stayed consistent. From there we look at whether a different charge level is realistically available and what it would take to get there. Knowing that early changes what you should and should not be doing in the meantime.