[Stentor]

He must have put some thermite inside his forge.

I think "they" knew he was going to make this video and they snuck the thermite in while he was taking a leak.

[lacrew]

Sounds like Stone Phillips was involved.

[Ruy Dias de Bivar]

Stick a piece of re-bar in a coal forge, turn the air flow on High and watch the fire works.

As the steel gets white hot it begins to throw off lots of sparks, and as the steel melts, melted white hot steel will blow out just like fireworks.

I’ve ruined several pieces of ironwork by letting them get overheated while I was beating another piece on the anvil.