So I was doing it one of my buddies and we killed all the unidad around the building, but sam fisher won't get into the vehicle we were in to extract. He just stands upstairs and keeps exercising and yawning. I checked to see if I had to lead him, but that wasn't the case either. It's so frustrating when you spend 2 hours and finally crack it after multiple tries but the mission glitches out. Anyone else had this problem?
I encountered this when I played with randoms.
I wasn't the host, but I was the infiltrator guy while two others sniping from outside. So naturally I was the one who would lead Sam out, but it didn't work even after I moved far away from the base back and forth. Once the base was safe enough, I commanded other guy to come over and he was able to activate the Lead command on Sam and we succeeded the mission after the extraction.
So try asking other players to use the 'Lead' on Sam.