I am sorry to hear of this situation for you
1 - Once you are charged, you will be given a preliminay court date. At that hearing you will be asked for your plea - obviously, you will say Not Guilty. Then the court will assign a court date. At that time you will have to tell the judge you do not have money for an attorney and you will be instructed how to contact the Public Defender
2 - I suggest you plead Not Guilty, get the PD to defend you and tell the truth. That the elements of the statute do not exist. This is his word and you have a witness. However, here is the link
to the statute in Iowa and you can see it states under 2
2. Any act which is intended to place another in fear of immediate physical contact which will be painful, injurious, insulting, or offensive, coupled with the apparent ability to execute the act
So unfortunately, the mere threat since you have the ability to make a fist and punch is enough. But discuss this thoroughly with your Public Defender.
3 - Unfortunately, based on what you are telling me you would not be eilgible to obtain any type of restraing order. I suggest you can complain to your floor leader about his terrible living and then see about getting a new room, if possible.
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Thank You and good luck with everything