Reasons

Alex waited with bated breath as he felt the spiritual sense of the senior in front of him tear into his body.

To pull something out of someone else's space, one either had to have a very strong understanding of a specific type of space dao that related to space in a confined form or simply have strength way higher than the one that you were stealing from.

It seemed to him that the senior in front of him was not aware of the Dao, and was thus forced to use the brute force method of stealing from another Soul space.

'There is still some Space dao in there,' Alex thought. He could sense the space aura that came along with the senior's senses.

The man wasn't lying when he said that this was going to hurt. Alex could feel the ripping pain in his chest, but he didn't let it show on his face.