Unfortunately for him, he underestimated Oliver's strength. In fact, even Andrew's strength, because although the assassin didn't know that inside this establishment Andrew is like a god, Andrew was still physically stronger than him.
The assassin had barely moved when Oliver immobilized him. The assassin had taken the first step but immediately felt a force pin him to the ground, slamming him into the floor. In seconds, under this pressure, his vision darkened, and he lost consciousness.
"Take him to the dungeon and find out who his target was and who sent him," Andrew said as if this event was just another day at work.
Oliver didn't even have to move; from the shadows, two people dressed in black appeared and took the assassin away. Several Shadow agents were hidden in the office, and although this assassin was experienced, he was no match for the Shadow agents, so he hadn't noticed them.