  The statics and dynamics of a stable, mobile three-dimensional (3D)
spatiotemporal vortex light bullet in a cubic-quintic nonlinear medium with a
focusing cubic nonlinearity above a critical value and any defocusing quintic
nonlinearity is considered. The present study is based on an analytic
variational approximation and a full numerical solution of the 3D nonlinear
Schr\"odinger equation. The 3D vortex bullet can propagate with a constant
velocity. Stability of the vortex bullet is established numerically and
variationally. The collision between two vortex bullets moving along the
angular momentum axis is considered. At large velocities the collision is quasi
elastic with the bullets emerging after collision with practically no
distortion. At small velocities two bullets coalesce to form a single entity
called a breather.
