Without specifics of the different situations (anonymized, but at least some specific story) it's hard to give specific thoughts or ideas as you asked.

When a woman brings up that she was sexually abused, that's a very high stakes conversation where men have immediate urge and lizard brain response to "investigate & solve" something, but in practical sense there's not much they can do about the specific past case and on the other hand there are many things they could say that would be horrible and cause long term damage to the relationship. So you will probably get a blank stare for a minute or two as this is running through the men's head in front of you. Some men will realize that there's no win-win and try to bail from the conversation. Some men will calm down and remember that they should "just listen and show support" and so they awkwardly try that.

So my tip, and it only applies in specific situations, is to try framing the conversation in a way that leaves space for the man to "solve" something. Ask what would make this better? What would prevent it from happening in the future? Get the man to brainstorm a solution together with you.