The investigations on the ground and in the air produce several leads. It is discovered that the wife of passenger Otto Gruenwaldt who died because fellow passenger Dr. Kenyon Walker was not available to help. Then Gruenwaldt suffers a heart attack on board. Dr. Walker rushes to aid the dying man. Captain Larkin voices his apprehension at allowing Dr. Walker to treat Gruenwaldt and Myerson concurs openly stating "it wouldn't be the first time" implying someone in his position could take advantage of the situation to eliminate Gruenwaldt. Dr. Walker turns the tables on Larkin regarding whether he should apply the life saving drug or not, telling him "Alright you make the decision.". This puts the weight of life and death on Larkin's shoulders for this patient. Larkin clearly realizes he now may be to blame for stopping Dr. Walker from administering a life-saving medical treatment. He reverses his decision and allows Dr. Walker to go ahead and inject the life saving drug. While doing so, Dr. Walker brazenly states to Larkin and Myerson that they wouldn't even know if he gave Gruenwaldt "too much or too little" of the drug demonstrating to Larkin and Myerson how far they are beyond their depth of knowledge regarding medical expertise.