This can be easily accomplished by using a Custom Trigger.
Say you got a tell like, "Mob1 is TSed!"
Set up a custom trigger with the following regex:
Code:
\\aPC -?\d+ (?[^:]+):\k\\/a tells you, "(?.+?) is TSed!"
Set that custom trigger to trigger a timer called "Traumatic Swipe" and you're all set. You don't have to make a spell timer named that... ACT will already store the timer mod without a valid destination timer.
The only problem is if that tell comes very late. You may miss modifying some AEs, or the recast mod may be in effect too long (30s after the tell).