somebody knows their game...
*Wow*
Basha, I believe you are talking about this part here, right? https://youtu.be/hrCWMxErroI?t=572
Normally the Conqueror should follow at this point, yes. If he does not, that indeed might be a bug. However, there is a cutscene at the end of the trail so maybe if you manage to get passed all obstacles there on your own you can still get through with the mission (and spawn your dude right next to you in the fight at the end after the cutscene)