I think it's really hard to come up with truly appropriate and especially helpful things to say at the time of serious loss and sadness. Most people don't really know what to say in those situations apart from standard brief banalities, which may or may not be helpful. I don't think Ts know this any better in general except that they may have a broader palette of those textbook banalities. I also think that many believe that sitting there with the client in silence can help at times - for me personally, this would never be the case in therapy.

Do you know what sort of reaction/feedback/reassurance would be useful for you? Maybe tell the T that and see if they do better?