Old Mr. Spark pretended to be still in a coma.
Seeing that Old Mr. Spark didn't open his eyes, Tristan said, "Old Mr. Spark, the pulse rate and heartbeat are synchronized. Your current heart rate is not something that a comatose person can have. I got to hand it to you since you should poison yourself."
As soon as Tristan said this, Old Mr. Spark on the bed slowly opened his eyes and looked at Tristan, "How did you see that?"
Tristan shrugged his shoulders and replied, "The blood test report. You could know some information from people's physical reactions. When you are poisoned, all the indicators are so terrible, but everything returns to normal after two hours. I suppose it couldn't happen if you haven't taken the antidote in advance."
Old Mr. Spark smiled and said, "Well, I ignored this. So why are you here? You came here at night just to expose me in this matter?"