Example: Someone in a group committed a crime or a wrong doing. No one saw them doing it it.
Upon discovery of the wrong doing, everyone is brought together to bring the matter to light.
The speaker addresses the group that this and that happened and so forth but doesn't say who did it.
During a pause, the culprit is the first to breaks the silence. Obviously due to unbearable tension. They don't confess, but rather just say anything to distract or lighten the mood.
What do you call this phenomenon?