The player places a minus both in Safety and Mission.
He calls for a flashback.
After the flashback, the anchor uses her ability to re-roll a die in Safety, potentially changing it to a zero or a plus.

Is this a legal timing, or should the die be re-rolled before the flashback, potentially making it impossible to call for an interlude?

Also, another question, just to make sure. Reducing Trust in effect of a mission action doesn't count as actual trust-breaking, and unless it results in destroying the relationship, there is no fallout action, right?

Anchor abilities occur after the pilot has placed dice, but before the effects (including flashbacks) occur. So in this case, a flashback was never a possibility.

You've got it right with trust and mission.

Hah, I thought the flashback+kind combo was just too weird.

Thanks for clarifications.