My companion disappeared in the mission of chapter X in the mission Anarchy in Paradise. Soon after Theron went away on the video. The normal thing was for me to win a new companion. But I was alone, and fighting like this is almost impossible. I already pressed the key "N" but can not summon any new companion.:/ Somebody help me, please.

I am alone since I started the mission of cap X KOFE I can't go on without a Companion :/ Someone help me please