Teen full meltdowns are often frightening in their intensity, or quietly devastating in their withdrawal. Both extremes are the same neurological event: the prefrontal cortex offline, the limbic system fully activated, the thinking brain unavailable. Add the teenage drive for autonomy and the developmental sensitivity to perceived disrespect, and these moments can escalate fast. Your regulation is the only lever that works right now.
I am not fighting with you. I love you. I am going to give you space and I will be right here.