I think what docjp is saying is that ster's T may have her own resistance to being present with ster. That she has not completed her own course of (good) therapy, rendering her vulnerable to being affected by ster's stresses.
IMHO, a therapist who needs to disengage from work that is too intense is not working in the best interest of the client.
In my experience, no matter how intense, and it was soooo intense, the work was, T remained steadfast in her commitment to be present.
A competent therapist is trained to deal with whatever intensity comes up in the sessions (and out of it).
If my T were to cop out of intense stuff, she'd be cheating me of good, competent therapy, and I would almost certainly try a different T.
Certainly you haven't provided enough information here for me to be able to offer an opinion of whether or not to continue with this T. I can only work with the limited info you provided here.
If you'd like to post more, feel free to do so.
In the meantime, take gentle care!