I think the 1 year of maybe deportation depends if the judge thinks the crime was the result of negligence or accident vs intentional. If the crime is the result of accident or negligence then you can stay. Pretty hard to argue that assault is anything but intentional though.
Best the op can do is settle. But it’s possible it will be a few months commutable to a fine. That won’t lead to deportation. Unless it’s aggravated assault or a deadly weapon is involved.
Previous admin should know as he did the fundraiser and I believe the perp did a long winded apology letter and was given leniency and allowed to stay. Not sure there was a long prison sentence or just a fine.
Did you fight back or initiate the fight? How did you knock them down - was it a punch to the head or more like you pushed them a bit and they fell over? Did you try offering them some money like 300NT to settle things?
The Immigration Act mandates deportation for someone who “Has been sentenced to punishments of imprisonment for one (1) year or greater by a judicial authority, whereas a person who commits a crime due to his/her negligence is exempted” (article 33.3 + 36.2.9)
Other than deportation, don’t forget the classic “shadow ban” move. Where the next time you try to apply for or renew something immigration related, it fails or is-perpetually-delayed. Stay safe everyone