Could be a two finger double stop-type chord? Closest I have gotten so far is std tuning, C position, the accent chord in question could be as simple as x 0 x x 4 5,
capoed up 3 frets of course.
It's a real quick change from a 1st position C and easy to bend/vibrate. Lot of damping going on on the bass end, Floyd Dipper Boy Council is taking care of business on the bass strings. Actually sounds pretty good like this: x 0 0 0 4 5, discordant but raggy.
I'll be interested to hear what others might say.