Am I a selfish coworker?

Im admin assistant and on my shift someone called from Pedia that "Arturo" has entered the ward even though he is covid positive and the caller said that the guard who receive the covid swab results (as an admin we give the swab results to guard it to accompany the watcher of each patient to the ward they are confine) said that admitting lady said that covid positive "Arturo" will enter the ward. I reviewed my coworker log list before me and I saw that Arturo on Nika's log list cuz the caller said if there's Arturo on our log list I said yes he wrote a form at 11 am on my coworkers duty. And she asked if its me who made it received to the guard the swab results I said not its Maam Nika. My coworker Sir Seed heard it and said I should always defense my coworkers that I should always protect them and that I shouldn't always think of my own personal benefits he's hinting that Im selfish. And he asked what was it? I explained that nurse from pedia said that guard said that admitting said to guard that Arturo can enter the ward even though he's positive. Sir Seed seems kinda mad and said why do you always say admitting? I said its what nurse said (Sir Seeds line of work is admitting) and that Sir Seed Asked me "Do you think Nika will do it?" I said no but then in my mind again I don't know tbh because I haven't talk to Nica About it and Sir Seed believes Nica won't do it. And then Sir Seed reviewed the receivers log list of swab results there's name of Arturo and he called the guard and asked who said it to him that admitting lady said to let Arturo in Pedia ward? Sir Seed asked if its me Alyssa (my name) or Nika (the duty before me) I saw the log list and its not me because its not my handwritten I explained to Sir Seed its not me and its not my handwritten. The guard said its Nika.
Am I a selfish coworker?
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What to do with my bossy coworker? And demanding doctors? ↗ by the way I don't know why but I think Nika is kind of person who will shame you in group chat if you make mistakes
Am I a selfish coworker?
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