Delayed Reactions
I think the trait is decent, but probably suffers from competition. It reminds me a lot of furious interruption (a good interrupt trait but the shatter competitor is just too good to pass) and I actually would love if both were merged since they are thematically related.
The best use I found for it was to synergize with Danger Time, so in a sense similarly to deathly chill, as a way to increase your damage to slowed foes. But Danger Time is not as potent as deathly chill for sure.