The more I think about it, there may have been some flanking-line convection that developed and moved into the main body of the storm. I suppose I'll figure it out when I review radar imagery tomorrow.
Jeff, that's exactly it. Another supercell (I think it was) formed as the first cell was cycling and slipped behind it. Greg Stumpf and I were on the same storm and in the same area and at times were confused by what was what (on top of repositioning from a W/E to NE/SW to N/S line). However, looking at the radar, the most intense rotation was with the 2nd cell (I think it was the 2nd cell, a lot was going on at the time) slipping behind the first. We were just east of Quail when the 2nd meso looked wrapped up nicely. However the trees and terrain (and rain and lack of light) kept us from viewing the area where the tornado reports came from and we kept repositioning farther east to avoid hail (even though it was small, didn't want to chance it).