My t responded in a similar way. I think she trusted in me to stay safe until our next session - and knew me well enough that I would more than likely survive until the next week, even if it meant taking it hour by hour. I don't believe she thought taking my freedom away from me was necessary at that point. She made sure she wad there for me if it got worse and she and I worked out a plan for when I needed immediate help.

The only time she has intervened was when I had a clear, doable and set plan to act on my thoughts.

Ts often, but not always, distinguish between sui ideation and a clear sui plan with the intent to act. Hope that helps in understanding your t's response.