Place it right after the accusation peaks in a chat screenshot edit, then follow it with a confused huh before cutting to the next scene, and use No No Wait Wait earlier to show the argument building.
Sobre este som
This is a short Swedish spoken reaction, lasting about four seconds, in which the speaker says they do not understand the other person's aggression. It gives a bemused, deflating feeling, turning a heated exchange into an awkward pause instead of a comeback. The plain wording makes the confusion itself the point, leaving the other side with nowhere to take the argument next.