Although Basil and company didn't spend a long time before closing the grave, they ended up standing silently in front of it for half an hour. With how well preserved Whitney's body was, it was just hard for them to leave.
'He looked no different from a sleeping person.'
'His skin—it was better than a sick person's, and he is dead!'
'Come on, why don't you show us your prankster side, Whitney? Come out of the grave, and say that you are alive!'
Death is a clear mark that signifies the end of our life. For ordinary people, when they die, they look like a dead person; however for Mages, due to their ability to use Magic, they would look no different from a living person.
While the thought of having one's loved one being reduced to a pile of bones by the decomposer is depressing for most people, having the body remained the same even after they are dead doesn't bring one happiness either.