The Bell is a variation of the tailslide maneuver, with the only difference being that the pilot performs a roll in the longitudinal axis during the final 1/4 loop (push or pull) while recovering to level flight, out of plane.
The Bell maneuver could be good for a close-in fight (less than 5-mi. separation) with a stealth aircraft. Skip Holm, a former USAF fighter and test pilot, suggested. Holm also tested aircraft for Lockheed and has flown the Su-27. He suggested that if a conventional fighter spotted a stealth aircraft at fairly close range and crossing at a 45-deg. or greater angle, a "Bell" maneuver could enable a rapid direction or plane-change without losing sight of the stealthy adversary.
Kvochur's Bell is a variation where the aircraft propels forward almost vertically while simultaneously breaking and following the movement of its tail.