How would/should someone handle someone else they care about having a pretty significant post traumatic flashback right in front of them? My male protagonist just woke up to find the female protagonist in the midst of one, she is completely out of touch with reality at the moment, reliving something horrible and literally clawing at the walls.

What is the best way to approach someone at that moment? My male protag knows a bit about PTSD as he's suffered it himself to a lesser degree, but he's never been confronted with having to help someone else.