It once happened to me that an umpani accidently hit another umpani - critical hit - and the all became hostile. It was in an solo attempt, and my character didn't anything in the combat (just stayed away from the nasties). So there must be some bug in the calculation.
When you got the message when you entered Trynton, its surely because one of them died in the meantime, and the kill was credited to you.
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