Weak Auras / Power Auras question.

I use Weak Auras to track buffs, procs and all kind of things and I've been experimenting with a few new set up but have hit a wall.

Specifically I'm trying to display if a specific Warrior has his/her Colossus Smash debuff on the target.

I see where I can set to see if I have or ANY OTHER warrior has Colossus Smash up but I can't find away to find which toon has it up.
I started trying to look at events in the combat log and use when it is cast by specific toons but I can't figure it out. I'm sure there are other applications for this kind of string but I'm not sure if it possible and I thought I would throw it out to the community.

Thanks!

You could set up a channel have all your chars join the channel, then set the weak aura to post to the channel, have another setup to read the char that posts to the channel and show the buff/debuff desired