Recently, I've been asked about this from a friend and I thought:
"Why not show everyone else once I'm done with the demo."
Just so you know, this can also be done for Mp Drain, Atk Drain, Defense Drain, etc. All but TP since there is no way to pinpoint how much TP someone has by events.
.
Things to look at:
Common Events
Skills
Noteboxes
"EXTRA NOTE" common events
Troop Page of Vectra
Here's the demo, it explains everything very thoroughly