The emergency doctor who had arrived earlier must have been the killer.
But how could the killer be sure that Cyril Atkins would go to that hospital?
Flynn Morris asked Mr. Zach, "Was there anything unusual before this?"
"Someone snatched a tourist's bag in the service area, so I asked Sir Bolton and Morgan to stay behind to guard, and I chased after the thief. But the thief was too far away, and fearing something might happen here, I immediately rushed back."
"During that time, did anyone approach Cyril Atkins?"
Mr. Zach was chasing the robber at the time: "I'll ask Sir Bolton and Morgan."
*****
"Yes."
Sir Bolton said, "A man wearing a hat bumped into him."
The man had staged a bag-snatching scene in advance, creating a diversion and chaos; then he took the opportunity to approach Cyril Atkins, whispering to him to feign illness and pretending to rescue him.
Cyril Atkins had no way out and, being in the same boat as Harper Bennett, had to take a risk.