My suggestions are that while using the stories suggested by the others, in the first place, this is a person who should never miss a chance to SHUT UP. In other words, be very precise in what you say happened, be very low key, absolutely NOT argumentative.
Listen very carefully to any questions you are asked and answer them concisely and respectfully. It does not matter that they're bringing in "hired guns" that may or may not mean anything. This is just an agency hearing. It's not a big dramatic criminal court proceeding where being over represented is a huge advantage. It is set up to be quite simple. You speak, they speak, you can ask questions, they can ask questions, either or both parties may be lying, the officer is supposed to go with the "more believable" of the two parties. The hearing will be recorded, you'll be sworn in, but there will be no objections, no cross examinations, no high level court case going on here.
An attorney is not needed, is not worth it for the amount of benefits you may or may not be approved to drawn and what they'd cost you, and may not know a bit more about unemployment insurance than anyone on here could pick up by reading the statutes, without their any experience in the particular area. They do not usually help too much, and would by NO means be worth you rushing out and hiring one.
If you are not approved for benefits in the hearing, you can always appeal beyond. But your best bet in ANY case is to be very quickly searching for new employment. Unemployment insurance, even if approved is not an on going source of income, it is seldom enough to keep you as well off as you'd be working at pretty much anything, and it is NOT based on how badly you need it. DO NOT even mention this or bring it up. Instead, mention how much you tried to do your job to the very best of your ability, how you did not intend to have a problem and lose your job, how you tried your best to avoid this confrontation, etc.

