If you make contact with an adventurer along a diagonal instead of one of the 4 cardinal directions, the game reads it as you trying to attack them, auto battles, and you get called a terrible Sovereign for killing an adventurer.
Do you have the tactical battle threshold set to 0 in the game options?
Same thing happened to me, so I just started selecting the champion and then using their actions menu to talk to them, it avoids any accidental killing.
What did the cursor look like when you moused over him/her? Did it change to the two swords cursor, or was it a speech bubble? Or a... third thing?
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