Since Spider had not fully recovered, he was obviously no match against the strong man who spared no effort in strangling him to death.
On the opposite side of the man, facing the door was Dr Sullivan, who was also trying to pull up the assailant's hands from Spider's neck.
From where she was standing at the door, Kathleen could only see the man's back, but she noticed that Dr Sullivan's movement was a bit slow as if he was being careful and restrained in his attempt to get the man off Spider.
He didn't exact the needed force one would have expected him to apply under such circumstances.
Seeing this scene, Kathleen rushed to the bed and pressed on a particular spot on the assailant's neck.
He instantly went limp and gradually fell to the ground, his hand on Spider's throat slackening in the process.
Paying no heed to the man, she stepped over him and went straight to check on Spider.