I as an employee had an incident that cut my hand. Can a employer Fire me, and then tell the clinic that I didn''t even work there and refuse to pay?

I was working for a company in Kansas, for about two months. Part of my job was to work on the presses in my area. A safety guard on one of the machines I was working on slipped off it''s safety latch and hit my hand and gave me a small laceration. My supervisor seeing the blood called me into the office and asked "What is with all the blood". I explained what happened and said I may need to get a tetanus shot. My supervisor then said, "We''re going to have to let you go". I thought he was kidding and started to laugh, but he said he was serious, and gave me the address to the clinic that they use. I went out, got my toolbox and quietly left, and went to the clinic to get my hand checked. The Clinic had to call the company while the nurse worked to fix up my hand. The person at Wescon informed the clinic that I have not worked there of a while. Security was called, but I had two papers that only a section leader would have, dated for that day.