Zane's head was throbbing and he was hardly able to see right. It hurt to open his eyes but he knew that he needed to in order to determine where he was at.
He was fairly certain by the bump and tumble that the car had gone off the road and over the ledge. He was lucky that Clive despite losing control managed to move it in such a way that prevented it from completely flipping over.
The situation was still not a good one however.
Zane was pinned by his seatbelt which made it hard for him to determine if the driver was still alive. He only knew that he was unconscious like Leo.
Even though the mafia boss had tried to shield him, the latter had still suffered a rather bad knock to the head when the car turned on it's side. He likely would have gone through the window if he didn't have his seatbelt on.