Figure 1
M. Koppitz, P. Moesta, L. Rezzolla/Albert Einstein Inst. & Zuse Inst. Berlin

Sucked together. A pair of black holes in the process of merging generates high curvature (red) in the merged horizon on the side of the smaller black hole. The new object will shoot off to the left but will quickly slow down as the highly curved region smoothes out and emits gravitational waves. (See video below.)