After Gail was shot, Hank's investigation enriched his character. He likes karaoke, opera, vegetarian food and delicious food. Before he was shot, he was humming an opera and enjoying the wonderful cooking. Hank got the experimental notes with neat handwriting and exquisite lines, which showed that he was a rigorous person. When Laobai planned to kill him, he said that he was still alive because Gail was cautious. On the last page of the experiment notes, Gail wrote "Salute to Old White", but luckily he used W.W. (walter white), which made Hank wonder whose names these two W were.
Gail's surprise is not only to show his resume, but also the espresso on the spot. He made a coffee machine with a unique distillation device in the chemical laboratory, and also studied the key technology of espresso and realized it, which made Laobai full of praise after taking a sip of coffee. After Gail's death, Laobai will still drink coffee from this device at work. It was not until the middle of the fourth season that I remembered that Gail was a pawn cannon fodder in this glass distillation device. Then I spent half a day replaying the third season, and I didn't find the second season until he appeared.
Most of the deaths of such characters in drama are sacrifices, sacrifices for others and sacrifices for the organization. On the other hand, Gail's death is not a sacrifice, but the extinction of dissidents, which is a life-and-death tragedy.