Last week, Ric Flair made his return to WWE, as he appeared on Raw in what is being said at this time as a one-time appearance with the company.
According to The Wrestling Observer, while Vince McMahon remained "adamant" about Flair not violating his 2008 storyline retirement from in-ring wrestling for WWE, officials made the decision to have Ric Flair at least get physical during his appearance. The decision was not made, however, until Flair underwent several medical tests, including an EKG, to clear him to get physical on Raw.
As far as the pending TNA lawsuit is concerned, it appears as if WWE feels the suit poses no significant threat to the company, and nothing has been heard of from TNA in several months, so the call was made to bring Flair in. Flair was reportedly hidden away in a trailer so as not to ruin his surprise return on Raw.