I'm very, deeply sorry to hear of the loss of your brother and to which he lost his life. If I could, I would like to try and shed some light on this very hard time for you. I know it is a difficult time for you and I'm sure you have many questions floating in your head is to what that guy was trying to retrieve from the floor. But please, please don't beat yourself up about it, if you do, it will only eat at you until you pass away. I have went through something similar and it's been a long time, but I was finally able to let it be what it is. Things happen and sometimes you just can't see it coming or maybe you can't do anything about a particular thing. Please just know that you will see your brother again and the two of you will be happy again. Have some faith in that, and in time things will get better. Again, I am very, very sorry for your loss. Please take care!