i am unsure..i had a similar issue a few days ago that triggered an angry part that blended with me as i do not feel anger (to that degree anyway). it happened so fast that it made my head spin, and then ended in scratching the arms/digging nails into the arms. it took a long time afterwards for things to calm down. i was trying so hard in that moment to stop it all, but i couldn't.

i personally seem to blend more with parts, so it's incredibly confusing because i'm still there, but they are too..and i cannot separate myself from them..so then i just...lose it sometimes.