sorry to hear that! Its never easy to lose a bird.
it means he wasn't ready. Although there is no scientific evidence for such, I believe pigeons rely merely on sight once within a mile of home. You can see this by overflies, bigger losses at shorter distances, etc. The fact that he had flown three times before being tossed likely means he didn't have the landmarks to rely on coming back.
get them ready by loft flying every day. I fly mine 30 times before tossing. And the first toss is about 20 yards away, so they get the idea of the training basket and coming home. They will come home faster if they are hungry, thirsty, if their mate is home, if they have eggs or young, etc.
Getting them ready for longer tosses is harder, but still worth it. I typically do a toss within sight, then half a mile, then 4 one mile tosses from different directions, then two three mile tosses from different directions, then a mile toss for a confidence booster, then a five mile, than ten mile, then fifteen mile, etc. Only proceed farther if your birds come home quickly and are like "is that all you got? I'm not even out of breath!"
It is never bad to go from a ten mile to a mile toss. It is bad to go from a mile to a ten mile toss when they are starting out. Train from all directions to prevent losses in the mile radius of the loft. Once your birds have come home reliably from twenty miles in all directions, you can begin to increase tosses by ten miles. Once your at 60 miles several times, go to a hundred on a nice day with a tailwind.
Many people say im babying my birds. but guess what? I buy a fourth of the bands at the start if the year that they do, and have the same number of birds that they do at the and of the year! Ha!
it is when homing pigeons are taken away from their home loft and released, allowing them to fly home. It is done to encourage exercising, strength, and to practice for racing. They will come home from distances of 800 miles if properly trained.
exactly! Although its hard to get them flying for longer than thirty minutes before tosses for me.

after the first toss about 10 miles away they will go an hour or more because of muscle and confidence.
really? Do people 'toss' hawks?
why did you only toss one? A single bird on the first toss is riskier than all your birds on the first toss.
yes, I do. Just fly your remaining birds when it is light, and it wouldn't shock me if he comes back. I hope he does!