An illustration of a classic “fireball.” A gas cloud (gray sphere) is monolithically accelerated via an interaction with the surrounding gas halo and forms stars along its path. Stars that form are no longer accelerated and move ballistically. This results in an age gradient, with older stars upwind of younger stars and the gas cloud downwind of the entire stellar population. Although it is not modeled in this work, the stripped galaxy would be upwind of this cartoon.