He has his computer safe at home and not lost. To avoid it you have to have your computer with you and safe in a case or something safe for a computer
This person is keeping his computer with him safe in his hands and not letting it fall while he is in hights. You can avoid dropping your computer by not having it near dangerous places where it can get damaged.
To avoid getting your computer in a fire the first thing you need to do is that if you see fire to have your computer in hand so you can just go out the door with it and not have any damages to it.
He lost his computer for not having it with him and safe. This will happen to you if you do not have your computer with you and safe
I lost my computer
He let his computer fall because he wasnt careful and it slipped out of his hand
This guy didnt worry anything about his computer and just ran out the door what if he had important things or a job his boss asigned him.