Oliver who was being carried by Specter, still couldn't move an inch, as the two were now in an underground path. While Specter was walking with Oliver on his back, the two of them felt a sudden tremor. Specter could also hear the sound of explosions from up above. With that he could guess what had happened.
Oliver heard the explosions too, and could guess what had happened as well. Still he denied it, he denied it with all his heart. No matter what his mind says, it must be false. He wouldn't, he couldn't accept what was happening.
Specter knew that it was possible that even with that kind of explosion, Hektor will still be alive, that's just how powerful he was. Also that suit he was wearing wasn't just an ordinary suit, it was the strongest shield of the Shadow Mercenaries, only the leader gets to wear it. Of course during the fight for the position, Gabriel wasn't wearing it.