The physical presence of the Lord Jesus, alive after the resurrection just as He promised He would be, transforms everything. We can see this very clearly in the fall and restoration of the apostle Peter after the resurrection of Jesus.
“And the servants and officers stood there, who had made a fire of coals; for it was cold: and they warmed themselves: and Peter stood with them, and warmed himself” (John 18:18).
“And the other disciples came in a little ship; (for they were not far from land, but as it were two hundred cubits,) dragging the net with fishes. As soon then as they were come to land, they saw a fire of coals there, and fish laid thereon, and bread” (John 21:8-9).
These two verses are just a few pages apart, and the Greek for the charcoal fire is identical (anthrakian). The apostle John is a very careful writer, and the contrast that is built in here is no accident. We are being invited to compare and contrast the two settings.