"Twister" Duet - Trial Run?

[cbBen]

I've always thought it odd that Stevie and Lindsey worked together on "Twisted" before the Fleetwood Mac reunion. Maybe they did so only after the reunion had been agreed to by all parties.

But if not, do you think it may have been something of a trial run to see whether Stevie or Lindsey (or both) could stand working with the other before committing to rejoining the band? Maybe one or both of them wanted to see how it went with a one-off project before committing to anything further.