Certainly in NATS there is a procedure for "defusing" staff after an incident. As a watch manager I would have removed the controller from the position and a trained (peer) counsellor would have been available to offer support.
On the face of it this sounds like a very serious incident and I do hope the Swiss have something in place.
My concern would be the state of mind of the flight crew who are left with the remainder of the sector to complete.