Rolling mill shooting red hot metal into rafters - GIF

Rolling mill shooting red hot metal into rafters.

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Previously:

https://www.homemadetools.net/forum/...997#post210577
https://www.homemadetools.net/forum/...316#post188660
https://www.homemadetools.net/forum/...907#post190938
https://www.homemadetools.net/forum/...785#post124283
https://www.homemadetools.net/forum/...952#post164257

The ceiling is lava!

That's some hot silly string.

Looks like someone took their eye off the ball... of molten steel it the rafters!

When these high speed mostly fully automated lines are flowing properly there are very few if any workers near them to shut them down in event of a problem. Even if someone had their hand on the kill switch and shut down the machine the instant a problem developed machines cannot stop instantly. Who knows how many furnaces and extruding mills that string of steel has already gone through from ingot to wire.
My concern is the aftermath, I'd be worried about the amount of concentrated heat on that Bar joist type truss. Is it enough to weaken it to the point it can no longer be considered safe. The roof was glowing red makes me think there is damage above as well.

I believe the red glow on the ceiling is reflection, not roof heat.