NASA had planned extensively for the Gemini rendezvous maneuvers, building a special spacecraft just for the purpose. The Gemini-Agena Target Vehicle (GATV) was an Agena-D rocket equipped with a ...

So they undocked from the Agena. And now because the mass was lowered, the malfunctioning thruster had a greater effect, and the Gemini started ... then a lot more to rendezvous with a second ...