At last, within a few seconds of the end of the bomb countdown, the children break through Alan's defenses, the explosives detonate, destroying the barn and killing everyone, including Alan.
The children break through Alan's defenses. This is within a few seconds of the end of the bomb countdown. This is at last. The children are destroying the barn. This is within a few seconds of the end of the bomb countdown. This is at last. The children are killing everyone. This is including Alan. This is within a few seconds of the end of the bomb countdown. This is at last. Alan's defenses are the explosives detonate.